Quote:
Originally Posted by Fitzgerald
Update:
There is no vacum or air coming from the tube that controls the heater control valve. Must be whats on the other end that is the problem. Im going to keep diging.
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The heater control valve is not the issue. There will only be vacuum when the A/C is at MAX. The problem is the temperature selector flapper door behind the glove box. There is a plastic lever that controls this door and the lever is prone to breakage. This is a very common problem. In my case, the plastic stud on the lever that the control cable attaches to was broken off. I drilled a hole in the lever where the stud had been and used a small machine screw and nut to make a new stud. It's worked fine for two years now. I suggest removing the glove box and looking at this lever.