I get either max hot air or max cold air. Cold air if I set the dial to any setting other than max heat and hot air when set to max heat. Can anyone tell me what module is malfunctioning?

Thanks.

Earl

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Earl



1993 190E 2.3
2000 Toyota 4x4 Tundra

Check the pushbutton panel and aspirator motor/interior temp sensor.


Joe

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Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
919-881-0364

I agree with Joe P. You should check to see if the incar temp sensor is drawing air. The sensor itself could also have a coating of dust covering it which seems to make them not perform as they should. Do a search on this topic for more info on testing. There are several good threads on this topic. Good Luck.

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Mercedes Benz Master Tech - Retired

Thanks guys... As soon as I read your posts I checked for a clogged hole in the little grill that feeds air to the temperature sensor. Sure enough it was chuck full of caked dust. There was a hat pin laying in the console next to the seat so I used it to pick and scrape the dust from the hole.

The climate control works again! I can now remove the parka from my back seat.

Lesson Learned: Hat pins should be added to the Mercedes tool kit.

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Earl



1993 190E 2.3
2000 Toyota 4x4 Tundra

Earl, i read with interest the easy fix. Where is the grill you cleaned out?

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)

Very near the front dome lamp. It's rather small. The fan should be strong enough to hold a 1cm square piece of paper.