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1987 944S Heat in summer weather

Heating and Ventilation

Vehicle Information: Model(924/944/968): 944S; Year: 1987; Body Type: Coupe; Total Mileage: 177,300;

This is about my wife's 'new' white 944S. I have read the many stories on this. In the past, I have tried the "disconnect the vac line to the front heater-hose valve" idea. This does not work, because the valve goes wide open if there is no vac applied to its connector. I have tried a spare used valve, and it seals very nicely when closed. I tried switching the central dash switch panel, because it is easy, and because my other (black) 944S has only speed 4 on its fan. I proved that the problem (white) car has a good set of switches, and that the other (black) car has a ballast, wire or fan problem. I have to leave on a big trip (NC) very soon. I unscrewed the vac actuator, and pulled it fully into the closed position, with a kitchen twist-tie. Now there is still hot air on the end-of-dash vents. Does this mean that this water valve is leaking even when firmly in the closed position? Is there any other way hot air can be coming out of the vents? I really do not want to delay my trip to take the dash and vent assemblies apart. Do you think replacing the water valve is worthwhile? It moves smoothly. The AC was emptied by the government auction place when we bought it. I plan to service it. Would this heat issue preclude AC use? Should I go Draconian on it and block water flow? I did this once many years ago on my son's (red) 944S. It worked well until I fixed its problem many weeks later.

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