Compressor Description

The A/C compressor is belt driven from the engine crankshaft through the compressor clutch pulley. The compressor pulley rotates without driving the compressor shaft until an electromagnetic clutch coil is energized. When voltage is applied in order to energize the clutch coil, the clutch plate and hub assembly is drawn toward the pulley. Magnetic forces lock the clutch plate and pulley together as one unit in order to drive the compressor shaft. When the compressor shaft is driven, the following events occur:
1. The compressor pulls low-pressure, low temperature vapor from the accumulator.
2. The compressor compresses the vapor into high-pressure, high temperature vapor.
3. The compressor pumps the vapor into the condenser.

The refrigerant oil is carried with the refrigerant. The refrigerant is used to lubricate the compressor. The compressor is equipped with the following components:
^ A pressure relief valve (4)
^ An A/C high-pressure cut-out switch (5) These components are placed in the system as safety devices

Refer to Compressor Replacement for further information about compressor operation.