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1995 993 C4 AC alternates between hot and cold

Heating and Ventilation

Vehicle Information: Model: 993 C4; Year: 1995; Body Type: Coupe; Total Mileage: 87000;

There are a host of AC problems with the 993. i have one since the car was new. When in AC mode the AC blows cold air and then for some short intervals blows hot air. it happens in max ac all the time, in normal ac if the diverter selectors are at the center point it does not happen with low blower speed, but with high blower speed or diverter valves at either extreeme it toggles hot to cold. engine speed does not effect it, and a 400 clam replacement of the control unit left me with the problem for the last 80k miles, does any dealer actually know anything about the AC on this car?

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