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Showing results for tags 'heat exchanges'.
I have a 1995 993 with a heating question. Since i have owned this car, i have never really had the best heat in the winter driving months. I purchased an OBD Porsche test tool that turns on the fans, opens flaps, etc... this tool is very useful, and when using it to test the HVAC, everything seems to work. My next experiment involved checking the differential pressure valves that sit underneath the engine and divert hot air underneath the car or to the cabin of the car if the heat is selected. these metal flaps seemed to move freely and i don't think they are of concern. I did find o