I've searched the forums, and haven't found this exact problem.

The compressor clutch sometimes engages, and sometimes does not when starting the car, which leaves me never knowing if I'm going to have a sweaty ride or not. However, I'd say most of the time it does not engage. Turning the ignition off and back on seems to have no effect on the problem. Once on or off, it does not intermittently engage. It either stays on, or stays off, until I turn the car off. So, I need some advice on where to look first. Here's what I assume:

1. The temp dial on the climate control unit, or some other part of the CCU may be bad.

2. A short or faulty wiring connecting to the compressor.

3. Compressor clutch is faulty.

Is there anything else it could be? Is it possible to replace the clutch without replacing the compressor? Where should I start?


*I have cleaned the clutch with brake cleaner to make sure it wasn't dirty or greasy.

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1984 300D