Compressor Clutch: Testing and Inspection

MAGNETIC CLUTCH DIAGNOSIS






When the air conditioning switch and the fan control knob (fan switch) are turned on with the engine running, current flows through the thermo switch (and the compressor) relay(s) to activate the magnetic clutch.

The air conditioning can be stopped by turning off the air conditioning switch or the fan control lever (fan switch). However, even when the air conditioning is in operation, the electronic thermostat, the pressure switch or the Engine Control Module (ECM: V6 Engine) is used to stop the air conditioning temporarily by turning off the magnetic clutch in the prearranged conditions to reduce the engine load which is being caused by the rise in the engine coolant temperature, and the acceleration of the vehicle, etc.

For the inspection of the relays, switches and units in the flow chart, refer to individual components testing and inspection."