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AC works, but then blows hot air (Read 290 times)
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Location: Kennett Square
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AC works, but then blows hot air
Sep 25th, 2020 at 1:44am
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Recently purchased a 1985.5 944 that has a problem with hot air blowing while the AC is engaged.  Upon the initial start up and while idling the AC blows cold. But this changes when the vehicle is driven as full hot air blows from the vents.  I checked the heater clip and it is fully functional and intact.  I changed the vacuum check valve. Still no change.

I also ran the vehicle to the point where hot air was coming from the vents and then let it cool down. I waited 10 minutes and I then started the car and turned the temperature to cold and turned the AC on.  The AC blew cold; however, as the car ran and the engine heated up the damper linkage change on its own (without me changing the temperature control) and heat started coming out of the vents.

Could the issue be a bad heater control valve? Or bad solenoid?

Any suggestions would be appreciated, thanks.
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