Test Box For Control Unit Operating Motor

The function of the operating motor or that of the motor activated solenoid valves A, C, D and E can be checked with a simple, locally made test box, regardless of the instantaneous temperature conditions. It is also possible to run the operating motor to any position with this test box, so that the above mentioned tests will be considerably easier to perform. The test box is connected on the car's electric system with the positive and negative leads. Pull off plug (S2) on the control unit and...

Required Parts

Porsche 928 Center Vent

1 Box housing approx. 60 x 40 x 20 mm 2 Potentiometer 2 k-ohms 2 watts 3 Resistor 3 k-ohms 2 watts 7 Diode 1 N 4001 or 1 N 4004 or similar 8 12-pin multiple plug AMP 583 371-1 or plug from wire harness 928.612.921.00 manual possible up to speed 4 1 - lowest speed no speed 4 with cold start interlock 4 The numbers 0 - 100 indicate the operating motor control in per cent. Operating motor position 0 COOLING operating motor linkage is moved down 100 - HEATING operating motor linkage is moved up...

Air Conditioner Changes

Trailer Hitch Atf Cooler

Cars with a 4-speed automatic transmission have an additional ATF cooler in front of the radiator. If a trailer hitch is service installed, the plug in the ATF cooler must be replaced with a temperature switch 928.606.309.01 , The temperature switch switches in an additional fan from an ATF oil temperature of 95 C on. The viscous fan clutch has a higher switching-on temperature of 75 C was 65 C and a different drive ratio. 0.98 for Germany, R, o. W. and USA 1.20 for Japan and Hot Countries The...

Solenoid Valve Activation Test Test Lamp

Testing Solenoid Valve

It is recommended to remove the control switch and trim panels on the sides of the center console see B 4a , to be able to check the activation of solenoid valves. Connect test lamp on car ground never use the solenoid valve holding bar . Place test tip on each electric wire connection. Note The cold start interlock must be switched off. Coolant temperature above 40 C. This temperature is guaranteed, if the needle of the coolant temperature gage has reached the end of the first white section....

Flap Function

Porsche 928 Red Key Switch

The vacuum units used to regulate the Flaps are activated by the solenoid valves. The flap regulation can be checked together with the above mentioned test. The pertinent flap must be in the following position when the test lamp lights up on a certain valve and vacuum is available. Center nozzle open 1st stage switch must be in upper pos. Center nozzle open 2nd stage switch must be in upper pos. Circulating air flap open air circulation D E- Center nozzle ventilation 1st 2r gt d Step D gt COLD...

Porsche 928 Evaporator Switch Blower

Porsche 928 Johtokaavio

Compressor ON, if AC switch is ON Compressor OFF, if AC switch is OFF Circulating OPEN circulated air air flap CLOSED fresh air Mixing flap center nozzle if center nozzle is closed, mixing flap remains open minimum speed manual speed regulation from 1 to 4 The numbers 0-100 indicate the control unit operating motor movement in . Operating motor position 0 cooling operating motor linkage moved down 100 heating operating motor linkage moved up The operating motor runs from down 0 to up 100 or...

Abcde Fghjk Lmnyzopqrstuvwx

Porsche 928 Relays

CEL 928.610.105.08 is not for installation in older models. Timing relay underneath center console, rear wiper relay next to battery ground point. Replace relay V with relay 928.616.131.00 when installing a trailer hitch. Central electric CEL is new. 928.610.105.09 The fuse plate holds 45 fuses was 35 . This was made possible by using flat fuses. The fuses are compiled into blocks of 5 fuses each and are no longer marked with numbers. The fuses must be counted off from left to right, in order...

Information

Porsche I E 1 The new edition of the test plan for the automatic heating and air conditioning system in Type 928 cars contains the following information. Fresh and Heated Air Controls - 1978 1979 Models 2 Wiring Diagram - 1978 1979 1980 Models 3-5 Automatic Air Conditioner Operation Up To 1983 Model 6 Test Plan for Automatic Air Conditioner 1980 to 1983 7 29 Air Distribution in General 30 31 Wiring Diagram in General Up To 1983 Model 32 Air Conditioner 1984 Model...

Flap Control

944 Turbo Porsche Thermo Switch

Here is a survey of sliding control lever and flap positions. Requirements engine running and vacuum built up. Heating is only effective when the upper sliding control lever is pushed to the right and the lower control lever is positioned at an air distribution symbol. Upper lever controls heater valve W and coritr. flaps B Upper lever controls heater valve W and coritr. flaps B Both levers must be on right end for defrost Lower lever controls air distribution, turning on AC and opens heater...