Climate Control Button Module Replacement - 1987300E (W124)

#1 05-31-1999, 02:02 PM

I have a 1987 300E. The CC buttons seem to be having problems.

1. Off button won't stay off - A/C keeps cliking on and off repeatedly.

2. EC mode, (economy i think) which is suppose to be just air and AC, turns the AC compressor on. I can't seem to just get plain old air.

3. None of the other modes seem to make a difference. Air always comes out of the top defrost vent and the vents closest to the door. NOTHING ever comes from the center front vents. Its like its always on defrost.

Lukily, the temp gauge and fan speed work fine. I get both cold or heat depending on the temp I select and the fan slows down as it reaches its set temp.

Can replacing this CC module fix these issues?

Should I buy new or rebuilt?

If rebuilt, who should I use? I've heard the place in Florida is not too good.

Thanks in advance,

Eli

#2 05-31-1999, 06:14 PM

I had the same problem... It has nothing to do with the buttons. You have to replace a relay.

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WEB Site : http://www.adamou.dpn.ch
A.S.C. 1999
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#3 05-31-1999, 08:59 PM

Adamou,
If you can't shut the system off with the off button, it would seem that the pushbutton unit would be the problem. Could you eleborate on which relay you are suggesting to be the culprit.

#4 05-31-1999, 09:25 PM

I have used various new and rebuilt units with great results. It does sound as if yours is faulty. It is easy to replace so even if you did get a bad one from a rebuilder, you would be able to send it back for another with ease.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

#5 05-31-1999, 09:26 PM

I have used various new and rebuilt units with great results. It does sound as if yours is faulty. It is easy to replace so even if you did get a bad one from a rebuilder, you would be able to send it back for another with ease.

------------------
Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

#6 06-01-1999, 09:10 AM

RBM : Actually I can't tell you which relay was faulty as I haven't replaced it myself

Sorry

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-------------------------------------
WEB Site : http://www.adamou.dpn.ch
A.S.C. 1999
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