[W126 Coupe] Heater Blower Motor

[Jim Ham]

I believe that the blower fuse is in the fusebox until 1986 when it was 
moved to the fender. My mechanic moved the fuse in my car ('85) out to the 
fender after the fuse holder in the fuse box failed from overheating. He 
seemed to think that this is a common problem with earlier 126s. If your 
blower fuse is still in the fusebox it's a pretty good bet that the holder 
has failed.

Regards,

Jim Ham

At 07:57 PM 3/15/2006, you wrote:

>Vedat & All,
>
>Thanks for the input; that gives me some more tasks to investigate.
>
>I am becoming more familiar with the climate control systems.  I have four 
>w126 380's here ('82, 2-'83's and '85) and NO TWO have identical 
>electrical layouts.  The blower problem is on an '83 SEC.
>
>I had been looking for a secondary fuse somewhere.  There is no fuse 
>holder by the brake booster but while looking, I DID find the blower motor 
>rersistor!  It's UNDER the brake booster, barely within sight not to 
>mention actually being able to TOUCH it.  REMOVING it would require a 
>miracle of biblical proportions.
>
>That resistor used to be mounted on the front passenger side wheel fender 
>on the 123's where r&r would have taken 20 minutes if you took a coffee 
>break halfway through.
>
>The QUESTION now is whether this resistor (looks like some coils encased 
>in a metal cage with round holes) is the one for the blower or the 
>auxilliary fan??  Does anybody know?
>
>This brings me to Vedat's comment.  IF his problem of the motor not 
>shutting off IS the resistor, the big expense must be the labour to 
>replace it not the cost of the part (the resistor costs about $100.).  And 
>I can understand why the high labour cost.
>
>I was about to ask Hein what his porcupine did for amusement.   Now I 
>know.  Fortunately, it appears that porcupines were not introduced to Benz 
>until 1986 so my models have an old boring black plastic relay/control 
>module.  (And it appears to be OK, as does the blower motor itself.)
>
>As soon as I free up the garage space I will rip into the climate control 
>module and investigate the push buttons motor switches.
>
>-Bellamy
>
>
>
>
>
>
>From: "Vedat Iplikci" <saveks at superonline.com>
>Reply-To: Vedat Iplikci <saveks at superonline.com>,Mercedes Coupes Mailing 
>Lists <mbcoupes at mbcoupes.com>
>To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
>Subject: Re: [W126 Coupe] Heater Blower Motor
>Date: Wed, 15 Mar 2006 11:53:30 +0200
>
>Hi Bellamy,
>
>Opposite to your problem, my blower motor refuses to stop running when the 
>climate system is off, but it may give a clue about yours. Mine actually 
>runs perfectly normal in any other running positions, but just goes to 
>lowest speed when the OFF button is pushed, but never stops. My mechanic's 
>diagnosis was that the resistor was bad, but both because I wasn't 
>convinced and it is too expensive a part, I just chose to live with it for now.
>
>I have no idea why Hein is referring to is his pet (:p) about your blower 
>motor, so this is my 2 cents...
>
>Vedat Iplikci
>1987 560 SEC Euro
>
>  ----- Original Message -----
>From: <mailto:hein.o at nf.sympatico.ca>Hein
>To: <mailto:mbcoupes at mbcoupes.com>Mercedes Coupes Mailing Lists
>Sent: Wednesday, March 15, 2006 2:51 AM
>Subject: Re: [W126 Coupe] Heater Blower Motor
>
>Bellamy,
>Don't know why, but I had the same problem a few years back. I ended up 
>changing the porcupine and the motor started working again.
>
>While doing this I did fool around with all the wires in the passenger 
>footwell, so it may have been a bad connection somewhere.
>
>I can't remember what I read and where, but I replaced the porcupine 
>because of some recommendation that I picked up somewhere. It worked. 
>Coincidence?
>Hein
>----- Original Message -----
>From: <mailto:eelploot at hotmail.com>Mister McGoo
>To: <mailto:mbcoupes at mbcoupes.com>mbcoupes at mbcoupes.com
>Sent: Tuesday, March 14, 2006 7:52 PM
>Subject: [W126 Coupe] Heater Blower Motor
>
>All;
>
>I have another electrical problem looking for an answer.
>
>The blower stopped running, to the best of my knowledge while I was 
>driving.  There is no power at the motor now.  The climate control system 
>has had no problems up until that point.
>
>The motor never made any rude noises, ran silently and smoothly
>
>The fuse is OK
>
>The fan (motor) runs fine (put 12v to the motor),
>
>The blower control unit - fan speed controller is OK (switched with a 
>known good unit)
>
>Does anybody have experience with the push button controls failing or the 
>climate control unit itself?  What other components have control over the 
>motor power supply?  Appreciate any ideas..........
>
>-Bellamy
>
>
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