A/C blows hot, heater blows cold, HELP - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 12-28-2009, 08:27 PM Thread Starter
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Date registered: Aug 2009
Vehicle: '86 MB 300 SDL (Sold); 94 MB E320 Wagon; 89 300 SE
Location: Edmonton, Alberta, Canada
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A/C blows hot, heater blows cold, HELP

My 1994 E320 Wagon has a heater A/C problem. When I dial up Heat I get cold and no control to where it is being sent or the volume of air moved.
The same with A/C , I dial up cold and get Hot and the same other symptoms.
In order to get that control I have to put the defrost on, again no control of anything as it sometimes will blow out of the A/C vents on defrost.

This just doesn't happen with my '86 300 SDL

Please help, I did look on the forums first but no results there.

Thanks in advance,
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post #2 of 2 (permalink) Old 12-29-2009, 04:08 AM
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Date registered: Dec 2009
Vehicle: 1999 clk320
Location: NEW YORK
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thats really odd im no expert but it could be some type of wiring problem maby??
im not sure i dont really know about the heat and a/c

1999 Mercedes Benz clk 320- with 19's

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