[W126 Coupe] heater/AC blower motor failure ??

[Dick Spellman]

The guys have great photos of both types on the mbcoupes list for you 
Rick.  If that does not prove to be the problem, I'd start with a check 
of the blower motor with 12vdc.  Hopefully, you do not have a passenger 
airbag.  This makes access to the blower and the control unit easier.  
Last is the pre-resistance group under the brake booster which is a lot 
of fun to get at (not).

Was the blower every intermittent before this event?

Dick

Rick Granlund wrote:

> HI-

>   My '89 560SEC had been sitting for almost a month due to an extended business trip.  When I took the car for a much needed jaunt up the interstate I noticed that the AC didn't seem to work.  When I returned home I checked to see if the compressor was turning,,,and it was, but the fan (blower) was not blowing air...in any mode. i.e. fast, slow or automatic.  It is not a blown fuse because the blower motor is on the same circuit as other things that work properly.  When I select 'economy' the compressor turns off, so the climate control seems to work properly.  I assume it is either the blower resistor pack or the blower motor itself.

>   On these cars, does a resistor pack failure put the blower into 'fast' as default?  Does anyone have the wiring diagrams and a troubleshooting procedure?  I think I should check the blower motor and/or the resistor pack with an outside +12 source to see if they operate but I don't know where it is or how to get to it.

>   I would appreciate someone emailing me the procedure for getting at the blower motor and resistor pack and checking them.

> Thanks for all your help in advance

> Rick

> rickard681 at cox.net

> '88 300CE (the baby coupe), '89 560SEC

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