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C230 Kompresser Coupe
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Have a 2002 C230 kompressor. The A/C blows hot air. The heat cannot be regulated. Heat from the engine blows into the car. New thermostat was installed. Everything went wrong.
 

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C230K Sport Sedan
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5,368 Posts
Welcome to the forum.

Hmm, don't know how a thermostat would make hot air blow when the A/C is on. There are 3 possibilities I can think of, 1) your a/c is not working, possibly a leak or low pressure and you are just blowing outside warm air in, 2) one of the many regulator valves that controls the flow of heat and a/c went bad, 3) your hvac dash controls went bad. The following document (large file) may help you understand how it all works and see if you can fix it yourself.

http://www.buellwinkle.com/W203HVAC.pdf
 
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