HVAC Temp Control [Archive] - GrandAmGT.com Forum


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11-05-2009, 01:32 PM
My heat won't work unless I turn the temp knob all the way to the right where it is the hottest if I move it just alittle to the right it is cold, so basically what I am geting is hot or cold air no in between. How do I fix this?

11-05-2009, 04:31 PM
From what I understand there is a blend door which either opens or closes to mix outside air with whatever temp is selected. It is operated off of vacuum. Sounds to me like it is either completely open or completely closed.

So to sum it up...the first thing I'd check is to see if you have a vacuum leak.