Quote:
Originally Posted by slk230red
When I had that problem it was a lack of vacuum due to a defective defroster pod behind the dash. I put a solid vacuum source at the valve to keep it closed until I replaced the pod.
I had to perform a vacuum test of the cross over valves that are located under the glove box on the right side to isolate the defective pod.
With the heat off, there should be vacuum on the red line going to the valve.
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OK, so vacuum is on to the monovalve (to keep it closed) with heat switch OFF. The vacuum line runs across to the drivers side under the front wiper. Ill try to locate where it goes next. Thanks for the reply!