Re: [MBZ] '85TD interior fan odd behavior update

2015-03-12 Thread Curly McLain via Mercedes
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

Re: [MBZ] '85TD interior fan odd behavior update

2015-03-11 Thread Jim Cathey via Mercedes
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

Re: [MBZ] '85TD interior fan odd behavior update

2015-03-10 Thread Curly McLain via Mercedes
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

Re: [MBZ] '85TD interior fan odd behavior update

2015-03-10 Thread Curly McLain via Mercedes
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

Re: [MBZ] '85TD interior fan odd behavior update

2015-03-10 Thread G. M. Brown via Mercedes
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

Re: [MBZ] '85TD interior fan odd behavior update

2015-03-10 Thread Max Dillon via Mercedes
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.

Re: [MBZ] '85TD interior fan odd behavior update

2015-03-10 Thread Peter Frederick via Mercedes
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

Re: [MBZ] '85TD interior fan odd behavior update

2015-03-10 Thread archer75--- via Mercedes
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

Re: [MBZ] '85TD interior fan odd behavior update

2015-03-09 Thread G. M. Brown via Mercedes
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

[MBZ] '85TD interior fan odd behavior

2015-03-08 Thread G. M. Brown via Mercedes
Guys, Just thought I'd touch base to see if any of you have experienced the same fan oddity and found the cause, etc. While driving around the other day on some errands and stopping/starting the car occasionally, the interior fan would not turn on after a restart unless I turned the car off

Re: [MBZ] '85TD interior fan odd behavior

2015-03-08 Thread Curly McLain via Mercedes
Also possible the brushes are worn. when the fan is off, (switch on) and you go over a RR Track, does the fan come on sometimes? If so, I'd change the brushes. If you drive with the switch on, and the fan starts and stops randomly, it can be brushes, or PBU. The controller is probably

Re: [MBZ] '85TD interior fan odd behavior

2015-03-08 Thread Mountain Man via Mercedes
G. M. wrote: Anyone got any suggestions as to where/what to look for? We have that in one of our W123. A slight turn of the key one way or the other makes fan operate. You might try that? mao ___ http://www.okiebenz.com To search list archives

Re: [MBZ] '85TD interior fan odd behavior

2015-03-08 Thread Peter Frederick via Mercedes
If a slight turn of the key switches the fan on, it's time for a new key switch. You won't like the price. Peter ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to:

Re: [MBZ] '85TD interior fan odd behavior

2015-03-08 Thread Andrew Strasfogel via Mercedes
Buy a used blower motor - they're dirt cheap and easy to install. On Sun, Mar 8, 2015 at 10:58 PM, Curly McLain via Mercedes mercedes@okiebenz.com wrote: Also possible the brushes are worn. when the fan is off, (switch on) and you go over a RR Track, does the fan come on sometimes? If so,

Re: [MBZ] '85TD interior fan odd behavior

2015-03-08 Thread Rich Thomas via Mercedes
The controller is probably going bad (or is bad I guess), bad solder joints or connections or switches or something. The repeat turning on aspect might just be happenstance that it decides to work at some point. Did you actually CHANGE YOUR FUSE? --R On 3/8/15 6:30 PM, G. M. Brown via