Quote:
Originally Posted by dondarnell
1986 944 Turbo. I've been having a problem with the heat and a/c working. Regardless of where I set the temp, sometimes I have a/c, and sometimes I have heat. So far, I have check the plastic clip, and that is intact (replaced it a few years ago), and I have replaced the hvac unit in the dash. Still I get the same thing, seems to be no control over what it wants to kick out. BTW, the a/c works and blows cold, when it decides to give me a/c. Same with the heat.
Any thoughts?
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It's definitely a vacuum line. It sounds like the heater control valve is randomly opening. IIRC it fails open.