Re: [MBZ] 124 HVAC blower motor diagnosis
Thanks Curly and Wilton. Very nice to have fixed it for a nice low price. Fortunate I found it so quickly. There are several yards scattered about Charleston, a couple up the road a bit in Summerville that I need to check out someday. Yes, big heat sink on the blower regulator is called a porcupine. It's aluminum, so I'll add it to my pile that will be sold to a recycler. -- Max Dillon Charleston SC '87 300TD '95 E300 ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
Where's the 124 porcupine? Directly above front passenger's feet in my/Tim's 350SDL. Replaced it once with shaky hands and bassackward view via mirror; got it done anyway. Wilt Max Dillon via Mercedes mercedes@okiebenz.com wrote: Thanks Curly and Wilton. Very nice to have fixed it for a nice low price. Fortunate I found it so quickly. There are several yards scattered about Charleston, a couple up the road a bit in Summerville that I need to check out someday. Yes, big heat sink on the blower regulator is called a porcupine. It's aluminum, so I'll add it to my pile that will be sold to a recycler. -- Max Dillon Charleston SC '87 300TD '95 E300 ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
It's under the blower motor in the fan housing, kinda a pain to get out (you have to hold your left hand in the right position as you fish around with your right, etc). Usually dirty, too. Peter ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
Yes, buried under the hood, under the windshield wiper and all the rain gutter pieces at the base off the windshield. -- Max Dillon Charleston SC '87 300TD '95 E300 On February 21, 2015 6:38:32 PM EST, Peter Frederick via Mercedes mercedes@okiebenz.com wrote: It's under the blower motor in the fan housing, kinda a pain to get out (you have to hold your left hand in the right position as you fish around with your right, etc). Usually dirty, too. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
On Fri, 20 Feb 2015 18:47:17 -0600 Peter Frederick via Mercedes mercedes@okiebenz.com wrote: You can get replacement electronics. Chinese, so who knows how long they will last, but the cheap replacement I put in the wagon works fine with the new blower.\ You cannot replace the controller with a resistor, it's a duty cycle controller, controls fan speed by switching the ground in and out. Blower will probably burn up if you use a resistor instead, it's meant to run full power or none, not by controlling current to the blower. The motor is an inductor and averages the voltage seen by the varying duty cycle to have a current that varies with duty cycle. (I could type out the equations, but ASCII makes that difficult!) That is no different than varying the current through the motor with a resistor, though the resistor will have a huge dissipation and get very hot whereas the switch transistor in the controller is either on or off and sees much less dissipation. You won't burn out the motor, but you could either burn out your resistor or burn yourself on it. Craig Right. the dodge resistor pack is essentially an electric heater. It provides supplemental heat as it is mounted. dogde mounts it in the heater duct through the front of the firewall. so the heat goes into the heater duct and the mounting is steel to steel, not plastic. Had I used it, I had planned to mount it on the bottom cover of the blower box. I am not sure if it would be ok, or if would melt the bottom cover. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
I don't think a DC motor is going to care how the RMS voltage and current are decreased. No. It doesn't usually even care that it is _DC_! The 'universal' motor type, in other words. The porcupine is also mounted in the airflow from the fan so its supplemental heat is used. (Unless you have the AC on for cooling purposes, then it's working against you.) -- Jim ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
Dan, copy on the steering wheel. All: new regulator works. -- Max Dillon Charleston SC '87 300TD '95 E300 ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
Thanks, Max. I suspect that something like this would go in short order, but it's a long shot I'm willing to take. A good price for a used one that's in decent condition without an air bag is probably $200. I have a spare airbag so that's not a concern. Dan On Feb 21, 2015, at 12:36 PM, Max Dillon dillonm...@gmail.com wrote: Dan, copy on the steering wheel. All: new regulator works. -- Max Dillon Charleston SC '87 300TD '95 E300 ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
On Sat, 21 Feb 2015 08:49:03 -0600 Curly McLain 126die...@gmail.com wrote: Right. the dodge resistor pack is essentially an electric heater. It provides supplemental heat as it is mounted. dogde mounts it in the heater duct through the front of the firewall. so the heat goes into the heater duct and the mounting is steel to steel, not plastic. They had a good idea! But, I presume, it also added heat in summer. Craig ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
Max, This goes for everyone on the list: If anyone sees a wood and leather steering wheel on an R129 or W140 in the knackers, let me know. They are pretty much interchangeable between the two chassis. I watch for them on eBay regularly but they're usually trashed or stupid expensive. A guy had one cheap this week but he leather was trashed. I was wondering how much it would cost to have the leather recovered or replaced... I found one a while back and put it on the S500 coupe. I just drove it a few weeks ago and I REALLY liked it, not to mention it looks really nice, too! Dan On Feb 21, 2015, at 11:36 AM, Max Dillon via Mercedes mercedes@okiebenz.com wrote: Home from LKQ now, $11.25 for a used blower regulator from a '91 coupe, 157k miles on the clock. Rich, there were a coupe 126 cars, both gassers, coupe and a sedan. If I get this in quickly, and it works, may go back for the nice black steering wheel in the coupe. Didn't have my torx bits with me to get the air bag off. -- Max Dillon Charleston SC '87 300TD '95 E300 On February 21, 2015 10:23:06 AM EST, Jim Cathey via Mercedes mercedes@okiebenz.com wrote: I don't think a DC motor is going to care how the RMS voltage and current are decreased. No. It doesn't usually even care that it is _DC_! The 'universal' motor type, in other words. The porcupine is also mounted in the airflow from the fan so its supplemental heat is used. (Unless you have the AC on for cooling purposes, then it's working against you.) -- Jim ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
Home from LKQ now, $11.25 for a used blower regulator from a '91 coupe, 157k miles on the clock. Rich, there were a coupe 126 cars, both gassers, coupe and a sedan. If I get this in quickly, and it works, may go back for the nice black steering wheel in the coupe. Didn't have my torx bits with me to get the air bag off. -- Max Dillon Charleston SC '87 300TD '95 E300 On February 21, 2015 10:23:06 AM EST, Jim Cathey via Mercedes mercedes@okiebenz.com wrote: I don't think a DC motor is going to care how the RMS voltage and current are decreased. No. It doesn't usually even care that it is _DC_! The 'universal' motor type, in other words. The porcupine is also mounted in the airflow from the fan so its supplemental heat is used. (Unless you have the AC on for cooling purposes, then it's working against you.) -- Jim ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
The new blower regulator is installed and working, took about an hour and forty-five minutes. I realize now that as the old regulator was failing, it may have been generating a lot of heat. I noticed that setting the temp lower would not always produce lower vent air temperature, especially for the side vents. We'll see during my test ride after I finish lunch. -- Max Dillon Charleston SC '87 300TD '95 E300 ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
Dan, copy on the steering wheel. All: new regulator works. -- Max Dillon Charleston SC '87 300TD '95 E300 That is a score! Congrats and attaboy! ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
On Sat, 21 Feb 2015 08:49:03 -0600 Curly McLain 126die...@gmail.com wrote: Right. the dodge resistor pack is essentially an electric heater. It provides supplemental heat as it is mounted. dogde mounts it in the heater duct through the front of the firewall. so the heat goes into the heater duct and the mounting is steel to steel, not plastic. They had a good idea! But, I presume, it also added heat in summer. Craig Most people run AC with the blower on High, which would minimize the heat generated. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
ATTABOY! Does the 124 have a porcupine? Wilt Max Dillon via Mercedes mercedes@okiebenz.com wrote: The new blower regulator is installed and working, took about an hour and forty-five minutes. I realize now that as the old regulator was failing, it may have been generating a lot of heat. I noticed that setting the temp lower would not always produce lower vent air temperature, especially for the side vents. We'll see during my test ride after I finish lunch. -- Max Dillon Charleston SC '87 300TD '95 E300 ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
Yes, I should have written blower regulator vice blower. -- Max Dillon Charleston SC '87 300TD '95 E300 On February 20, 2015 12:52:58 AM EST, Craig via Mercedes mercedes@okiebenz.com wrote: On Thu, 19 Feb 2015 23:07:10 -0500 Max Dillon via Mercedes mercedes@okiebenz.com wrote: May go by the knackers Saturday, see if a good used blower is to be had. From what I picked up from the thread, you'll need the something that drives the blower instead of another blower. Craig ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
You cannot use a rheostat to regulate blower speed manually, the thing would have to be good for dropping quite a bit of power. (Think: Frankenstein movie prop, that level of technology.) Consider the heat sink fins that are on the porcupine itself, or the physical size and robustness of the blower resistors in the pre-porcupine days. You can have full power, or you can get a resistor box and flange it in, or you can design/build something more elaborate... Or you can just replace the porcupine with a good one. I do not know if it's possible to _repair_ a porcupine, such as with a new power transistor inside or something. -- Jim ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
You can get replacement electronics. Chinese, so who knows how long they will last, but the cheap replacement I put in the wagon works fine with the new blower.\ You cannot replace the controller with a resistor, it's a duty cycle controller, controls fan speed by switching the ground in and out. Blower will probably burn up if you use a resistor instead, it's meant to run full power or none, not by controlling current to the blower. Peter ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
Plan A is find a used from a later gasser at the knackers tomorrow (predicted high of 63F, whoohoo!). Plan B will be a toggle switch to provide full power until I can repeat Plan A. -- Max Dillon Charleston SC '87 300TD '95 E300 On February 20, 2015 7:47:17 PM EST, Peter Frederick via Mercedes mercedes@okiebenz.com wrote: You can get replacement electronics. Chinese, so who knows how long they will last, but the cheap replacement I put in the wagon works fine with the new blower.\ You cannot replace the controller with a resistor, it's a duty cycle controller, controls fan speed by switching the ground in and out. Blower will probably burn up if you use a resistor instead, it's meant to run full power or none, not by controlling current to the blower. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
On Fri, 20 Feb 2015 18:47:17 -0600 Peter Frederick via Mercedes mercedes@okiebenz.com wrote: You can get replacement electronics. Chinese, so who knows how long they will last, but the cheap replacement I put in the wagon works fine with the new blower.\ You cannot replace the controller with a resistor, it's a duty cycle controller, controls fan speed by switching the ground in and out. Blower will probably burn up if you use a resistor instead, it's meant to run full power or none, not by controlling current to the blower. The motor is an inductor and averages the voltage seen by the varying duty cycle to have a current that varies with duty cycle. (I could type out the equations, but ASCII makes that difficult!) That is no different than varying the current through the motor with a resistor, though the resistor will have a huge dissipation and get very hot whereas the switch transistor in the controller is either on or off and sees much less dissipation. You won't burn out the motor, but you could either burn out your resistor or burn yourself on it. Craig ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
You cannot use a rheostat to regulate blower speed manually, the thing would have to be good for dropping quite a bit of power. (Think: Frankenstein movie prop, that level of technology.) Consider the heat sink fins that are on the porcupine itself, or the physical size and robustness of the blower resistors in the pre-porcupine days. You can have full power, or you can get a resistor box and flange it in, or you can design/build something more elaborate... Or you can just replace the porcupine with a good one. I do not know if it's possible to _repair_ a porcupine, such as with a new power transistor inside or something. -- Jim I had a resistor set left over from the old dogde van. It was 5 speed. I contemplated getting the switch I salvaged out of the van and using it and the resistor bank to generate 5 speeds ranter than the one high speed. If it had gone until April with hout finding a good porcupine, I would have done that. But since I found a good porcupine for a reasonable price, i put it back to factory rather than bodging 'merkun iron into it. I always like upgrading the frod or the VW with used MB parts, but it has to save a lot of money on a rustbucket MB before I will put 'merkun parts on the MB. The SDL qualifies on the rustbucket part, but the savings were not substantial enough. I'd have put in the dogde resistor bank and switch if the only option was to buy a NEW porcupine. The 240D/RTW heater controls that just work are much preferable to the ACC crap that always breaks. (sorry Jaime, but I don't like spending thousands of $ and/or taking days of time to replace all the underdash junk when a simple cable will do) Now it seems like all the heater box doors are shut. The fan blows on high, but not much air is moving. On the first SDL, i eliminated frozen feet after spending several thousand $$ on the ACC buy sticking a chunk of 2x4 in the heater box to hold the flap open. If it ever warms up a little, I will need to do that on this SDL and try to find a way to block open the defrost and dash vents. Temps near 0ºF or below for the foreseeable future. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
Peter wrote: You cannot replace the controller with a resistor, it's a duty cycle controller, controls fan speed by switching the ground in and out. Blower will probably burn up if you use a resistor instead, it's meant to run full power or none, not by controlling current to the blower. The heat load _in_ the motor of a brush type DC motor is directly related to the RMS voltage. One way to vary the voltage is pulse width modulation (PWM)- which is what you are describing. Full on, full off, switched pretty fast. The off time pulls the average down so the motor runs slower. Another way to lower the RMS voltage is a resistor. A big disadvantage of using a resistor is the wasted heat. The resistor ends up throwing away as waste heat a significant portion of the power used. But a resistor is very simple. A PWM circuit isn't very complex - unless you compare it to a resistor. Its advantage is almost no wasted heat, since the controller is controlling a switch that is either on or off. I don't think a DC motor is going to care how the RMS voltage and current are decreased. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
Thanks, I'll dig into the archive... May go by the knackers Saturday, see if a good used blower is to be had. Rich, up for a trip to the knackers? -- Max Dillon Charleston SC '87 300TD '95 E300 On February 19, 2015 9:35:20 PM EST, Curly McLain via Mercedes mercedes@okiebenz.com wrote: W126 I cut off the harness from the dead porcupine, wired a toggle switch into if, with terminals to hook up the motor. Yellow not needed. I drilled a hole in the bottom of the box where the porcupine had been and put the toggle switch there. I htink the 124 is similar. When I was able to get a replacement porcupine for a reasonable price, everything unplugged and the new porcupine went in. Only one hole to plug if you want to bother. Trying to drive in below zero with no heat or defrost was way too much like driving a rusted out Karmann Ghia 45 years ago. Scrape the inside, roll down the window, scrape the outside, try to exhale slowly out of the side of your mouth to minimize frosting up the window while driving. I think the Nov writeup has more detail. Peter chastised me thoroughly for running the blower full blast with the toggle switch, but even with the porcupine, it runs full blast unless the sun is out and the temps get close to 40 or so. It sure beats no defrost and no heat! ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
On Thu, 19 Feb 2015 23:07:10 -0500 Max Dillon via Mercedes mercedes@okiebenz.com wrote: May go by the knackers Saturday, see if a good used blower is to be had. From what I picked up from the thread, you'll need the something that drives the blower instead of another blower. Craig ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
[MBZ] 124 HVAC blower motor diagnosis
Dieselvolk, 1987 300TD, 338k miles, recently put back on the road after about a two year time-out to replace the head. The blower motor has become very weak recently. I noticed it was weak when I started driving the car again last fall. A couple of times it didn't work at all, but usually would start working after driving the car a bit. It recovered to about half strength after a few weeks of driving the car, but now it has really gone downhill. I've opened up the fan cover after removing the wind shield wiper, and applied 12 volts directly to the motor, and it runs just fine, nice and strong. Sounds like a bad voltage regulator, or maybe the PBU is bad? -- Max Dillon Charleston SC '87 300TD '95 E300 ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
Did someone on this list post a cheap solution for bypassing the blower motor voltage regulator with a rheostat for manual control of the blower? ___ Ja, read the archive from November ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
OK, pretty sure I've isolated to the regulator. There is a three-pin connector that comes out of the fan housing to a firewall connection on the driver's side. Yellow, red and black wires, go to the voltage regulator (N29 on the wiring diagram). Red is power from the 30A fuse on the drivers fender, black goes to ground, and yellow is the signal from the PBU. PBU signal varies from 1.2 volts (low fan speed button pushed in) to 7.3 volts (high speed fan button pushed). On Thu, Feb 19, 2015 at 6:49 PM, Max Dillon dillonm...@gmail.com wrote: Dieselvolk, 1987 300TD, 338k miles, recently put back on the road after about a two year time-out to replace the head. The blower motor has become very weak recently. I noticed it was weak when I started driving the car again last fall. A couple of times it didn't work at all, but usually would start working after driving the car a bit. It recovered to about half strength after a few weeks of driving the car, but now it has really gone downhill. I've opened up the fan cover after removing the wind shield wiper, and applied 12 volts directly to the motor, and it runs just fine, nice and strong. Sounds like a bad voltage regulator, or maybe the PBU is bad? -- Max Dillon Charleston SC '87 300TD '95 E300 -- - Max Charleston SC ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
I used a simple ON/OFF toggle switch to operate blower in my 350SDL on a weekend years ago. Wilton Meade Dillon via Mercedes mercedes@okiebenz.com wrote: Did someone on this list post a cheap solution for bypassing the blower motor voltage regulator with a rheostat for manual control of the blower? ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
Did someone on this list post a cheap solution for bypassing the blower motor voltage regulator with a rheostat for manual control of the blower? ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 HVAC blower motor diagnosis
W126 I cut off the harness from the dead porcupine, wired a toggle switch into if, with terminals to hook up the motor. Yellow not needed. I drilled a hole in the bottom of the box where the porcupine had been and put the toggle switch there. I htink the 124 is similar. When I was able to get a replacement porcupine for a reasonable price, everything unplugged and the new porcupine went in. Only one hole to plug if you want to bother. Trying to drive in below zero with no heat or defrost was way too much like driving a rusted out Karmann Ghia 45 years ago. Scrape the inside, roll down the window, scrape the outside, try to exhale slowly out of the side of your mouth to minimize frosting up the window while driving. I think the Nov writeup has more detail. Peter chastised me thoroughly for running the blower full blast with the toggle switch, but even with the porcupine, it runs full blast unless the sun is out and the temps get close to 40 or so. It sure beats no defrost and no heat! ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
