Re: [MBZ] '85TD interior fan odd behavior update
Try getting a used fan and swap it out. (Car-part.com Should be $25 or less) Could be a bad porcupine also. Max can tell you about testing the porcupine. Basically, power and ground in, modulated power out. should be full power on defrost. What about the tube and sampling fan? is that in good condition? If the computer thinks it is warm enough, you get no fan, no heat. I am leaning more toward the porcupine or the sampling tube/fan. For anyone keeping track, I changed out the PBU with a spare I have and the same thing occurs where the interior fan does not come on when the Hi-speed fan and middle (lower) PBU button are depressed after the car is started but the fan will start when the defrost button is depressed, so it looks like I've gotta' look into the connection(s) to the fan itself. G. M. Brown Brevard, NC ___ 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] '85TD interior fan odd behavior update
The systems with the translucent AUTO button don't have porcupines, they have a separate fan control relay box (behind the glove box) and use a resistor pack under the hood. Plenty of places to go wrong. The PBU is reputedly designed to not have problems with any manner of simultaneous button pushes, but I have not verified this. -- Jim ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: https://server.secureplusplusfour.net:2083/cpsess595060604/3rdparty/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] '85TD interior fan odd behavior update
If it has the acc 3 with puchbuttons, I think it does. But I don't know. Never drove a 123 300D on the road. I don't think a 123 has a voltage regulator porcupine? I do think that removing and testing the fan motor is next. -- Max Dillon Charleston SC '87 300TD '95 E300 On March 10, 2015 5:48:51 PM EDT, Curly McLain via Mercedes mercedes@okiebenz.com wrote: Try getting a used fan and swap it out. (Car-part.com Should be $25 or less) Could be a bad porcupine also. Max can tell you about testing the porcupine. Basically, power and ground in, modulated power out. should be full power on defrost. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: https://server.secureplusplusfour.net:2083/cpsess595060604/3rdparty/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] '85TD interior fan odd behavior update
Good luck in getting the buttons to work properly. Currently I have to punch the button next to the defrost button to get the fan running, and then punch the middle or button on its right to get hot or cold. Spraying the buttons mechanisms with Deoxit improved the situation but I still have to go through the process of getting the fan running, and then punching the hot or cold button. I replaced all three control units with used units from Arizona, which didn't work at all until I resoldered the button unit. (The original unit had burnt up while driving; probably because I accidentally punched two buttons simultaneously). The Arizona units had the same defects. I suspect that the problem might be in the pushbutton contacts or the mechanisms that engage one while disingaging another. Gerry All good reasons I love the 240D and older cars with the dual heat manual controls. ACC was a gimmick to sell expensive cars, but is never allowed separate R and L control, and is always breaking. () My favorite 300D would be a 240D 3.0 ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: https://server.secureplusplusfour.net:2083/cpsess595060604/3rdparty/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] '85TD interior fan odd behavior update
For anyone keeping track, I changed out the PBU with a spare I have and the same thing occurs where the interior fan does not come on when the Hi-speed fan and middle (lower) PBU button are depressed after the car is started but the fan will start when the defrost button is depressed, so it looks like I've gotta' look into the connection(s) to the fan itself. G. M. Brown Brevard, NC ___ 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] '85TD interior fan odd behavior update
I don't think a 123 has a voltage regulator porcupine? I do think that removing and testing the fan motor is next. -- Max Dillon Charleston SC '87 300TD '95 E300 On March 10, 2015 5:48:51 PM EDT, Curly McLain via Mercedes mercedes@okiebenz.com wrote: Try getting a used fan and swap it out. (Car-part.com Should be $25 or less) Could be a bad porcupine also. Max can tell you about testing the porcupine. Basically, power and ground in, modulated power out. should be full power on defrost. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: https://server.secureplusplusfour.net:2083/cpsess595060604/3rdparty/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] '85TD interior fan odd behavior update
The W123 has a resistor network up by the air filter housing somewhere I think (I'll check with my brother). At least somewhere up front on the passenger side, as my brother had to fix his where the car got hit. If the connections at the resistor network are bad, the fan will work intermetently at any speed by high, where it's bypassed. Peter ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: https://server.secureplusplusfour.net:2083/cpsess595060604/3rdparty/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] '85TD interior fan odd behavior update
Good luck in getting the buttons to work properly. Currently I have to punch the button next to the defrost button to get the fan running, and then punch the middle or button on its right to get hot or cold. Spraying the buttons mechanisms with Deoxit improved the situation but I still have to go through the process of getting the fan running, and then punching the hot or cold button. I replaced all three control units with used units from Arizona, which didn't work at all until I resoldered the button unit. (The original unit had burnt up while driving; probably because I accidentally punched two buttons simultaneously). The Arizona units had the same defects. I suspect that the problem might be in the pushbutton contacts or the mechanisms that engage one while disingaging another. Gerry G. M. Brown wrote: For anyone keeping track, I changed out the PBU with a spare I have and the same thing occurs where the interior fan does not come on when the Hi-speed fan and middle (lower) PBU button are depressed after the car is started but the fan will start when the defrost button is depressed, so it looks like I've gotta' look into the connection(s) to the fan itself. G. M. Brown Brevard, NC ___ 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. - No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.5751 / Virus Database: 4299/9270 - Release Date: 03/10/15 -- arche...@embarqmail.com arche...@embarqmail.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: https://server.secureplusplusfour.net:2083/cpsess595060604/3rdparty/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] '85TD interior fan odd behavior update
The odd behavior which I described previously does not occur when the fan is on and hitting any sort of bump, the fan does not come on after restarting the car (e.g., when running errands) when it's ptreviously been running but seems to come back on after 2 or 3 restarts. And, yes the #8 fuse was replaced with a new one to no effect. I noticed a little while ago while running some errands that the fan will come on when the defrost button of the PBU is depressed but the other buttons don't seem to work when the high speed fan button is also depressed. And, yes I've pushed the high speed vs. the low speed fan settings to try to get the fan to run, but only turning off the car and restarting seems to help. Since my PBU has been stripped/resoldered, I don't believe the problem is there but I'll replace it with the spare I've got to see. G. M. Brown Brevard, NC ___ 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.
