E-Class (W124) 1984-1995: E 260, E 300, E 320, E 420, E 500 (Includes CE, T, TD models)

Weird Heater-A/C problem...

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Old 10-14-2007, 07:55 PM
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1987 W124 300D
Question Weird Heater-A/C problem...

Howdy All,

My 300D environmental system has been freaking out lately. When I select the AC or vent positions on the switch panel, the fan and A/C pump click on and off. If I select the defrost position, the pump and fan work fine.

It started about a month ago when I noticed a lot of clicking from the dash in the switch area.

Is there a relay or controller going bad or a ground problem here? I wonder if anyone has experienced this issue... There seems to be a thread here for just about every problem imaginable for this car. If I ignore the clicking and fanless heating for a while, it works normally.

I don't have time to troubleshoot all the electrical connections, so hopefully this is a common thing. I trust you guys to have some kind of horror story for me...

Thanks,

Kevin
Old 11-10-2007, 01:14 AM
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1987 W124 300D
Smile ...Threw money at it.

Howdy all,

I fixed the problem with a used climate control unit from eBay. $25.00 and everything works again.

A simple fix for an annoying problem...
Old 11-10-2007, 01:25 AM
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92 500e, 95 E34 525I Touring
thanks for the update....

oh and i noticed...original post Oct. 14: 10-14

followup post: 10:14 PM.

yeah...im wierd like that.
Old 11-10-2007, 01:32 PM
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1995 E320 SE, 162,000 Miles (Sold)
^ Did you see "The number 23"? Great flick...you might like it.

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