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#32: 12-30-2010, 08:36 AM
 
 ehsnils
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I would first check if there is a servo actuator for the mix of hot/cold air for the passenger side that has failed.

But there should also be a feedback sensor for each side, and if that fails and says that it's warmer than it really is the heat will also decrease.

I haven't studied the heating system in detail, so I'm not entirely sure about the details. And it sucks to crawl under the instrument panel...