why no heat from heater? a/c is working. is it a sensor or control problem?

Asked by May 22, 2012 at 04:14 PM about the 1990 Volkswagen Passat

Question type: Maintenance & Repair

2 Answers

1,605

there is a water control valve that shuts the flow of coolant to your heater core off when A/C is activated, sounds like the relay that controls that valve or the valve its self is faulty.

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My daughters 03 Passat had the same problem and in HER car's case we got heat by just putting the re-circulating dial to circ or to no circ (I forgot which position, but it made a WORLD of difference). In her case there was (and still is) a flap that opens up the fresh air in, and it was stuck open. I remember someone coaching me over the phone, and I could see it stuck open with a little flashlight (way under the dash at the heater box assy). Sorry I can't be of any more help. VR Brian

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