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1991 964 C4 Cab Climate Control malfunctioning

Heating and Ventilation

Vehicle Information: Year: 1991; Body Type: Cabriolet; Total Mileage: 34800;

Last month (December '04 - winter in NY), I purchased a 1991 Cab C-4. Unfortunately, the Climate Control does not work properly. The symptoms are:1) Constant heat from driver's side & middle vents. Far right passenger's side vent blows cool air.2) Round thermostat dial (blue & red dots) does not work.3) Slide Controls appear not to work.4) Blower fan 0 to 4 does work properly.5) Defrost button engages & blasts air through vents not to windshield.6) A/C button turns on (yellow light) but the condenser/compressor appears not to engage -- no change in RPM's, etc.I have Adrian Streather's 964 book & it appears that the two mixing chamber Servo valves under the front hood may be bad. Any other ideas?Thanks. This is my 1st post!State: NYTotal Mileage: 34800Car Use: Street use only

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