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Test A/C Unit

Electrical

Vehicle Information: Model(924/944): 944; Year: 1985; Engine (type, size, modifications): 2.5; Total Mileage: 206,000;

I have just repaired the clutch and the magnetic coil of my 1985-1/2 944 Porsche. I would like to test if the A/C unit is working correctly. I tested the magnetic coil with an outside 12 volt battery source. The coil works fine. It pulls the magnetic clutch. But if I use the A/C switch at the dash, nothing is happening. How can I isolate the low pressure switch, the de-icer switch, and the water temperature switch? What procedure will I take? Is it the wrong time of the season to do it?

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