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Two of the actuators were making noise unless the system was set to LOW. In Eastern Ontario we will soon need heat, so it was time to set things right. The one I found behind the glove box pushed a white plastic rod to what I suspected was the fresh air baffle. It was jammed, but after some time on the bench and a little grease, I put it back to work opening the fresh air flow. Delicate touches from 12V, alternately reversing the polarity, soon loosened the device to where it would reliably cycle, so I snapped its little ball joint into the cup of the plastic rod, and it worked
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