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D) Pull off wires from coolant temperature sending unit in engine compartment (large plug connection). e) Program control in OFF position. Note If the above tests shows a defect, which can't be found in control switch or wiring, check the control unit as follows. Connect test lamp on connected plug (S2) term. 3 (brown) and term. 10 (green). Test lamp should come on at coolant temp, above 10 4 F. Test lamp should go out at coolant temp, below 104 F. (Pull off coolant temperature sending unit...

Porsche 928 Recirculation Flap

The vacuum servos regulating the flaps are activated by solenoid valves. The flap activation can also be checked in conjunction with the above mentioned test. If the test lamp comes on for a given valve (vacuum available) , the corresponding flap must be in the following position. Footwell open Defroster closed Center vent open 1st step (switch must be in bottom position) Center vent open 2nd step (switch must be in bottom position) Mixing flap open Heater valve closed Recirculation closed D.)...

Temp Mixing

FLAP POSITION o i0 20 30 40 50 60 70 80 90 100 928 - AUTOMATIC AIR CONDITIONER (Climate Control) (Flap Hose Diagram) Center vent double servo (orange Center vent double servo (brown) Recirculation servo (blue Recirculation flap Blower connection (fresh air Electric vacuum solenoid valve Servo motor and control unit 10 Water valve + mixture flap 11 Vacuum solenoid Recirculation flap 13 Center vent 1st 2nd step 15 Temperature sender, coolant 16 Temperature switch, evaporator 21-Ashtray Diagram 3...