Compressor HVAC: Description and Operation

A/C Compressor and Clutch Assembly

NOTE: Internal A/C compressor components are not serviced separately. The A/C scroll compressor is serviced only as an assembly.

The A/C compressor has the following characteristics:
- A variable capacity function controlled by a suction pressure device.
- Displacement of 90 cc (5.5 cubic inch).
- A fixed and orbiting scroll to provide refrigerant compression.
- A non-serviceable shaft seal.





The magnetic A/C clutch has the following characteristics:
- It drives the compressor shaft.
- When battery positive voltage is applied to the A/C clutch field coil, the clutch disc and hub assembly is drawn toward the A/C clutch pulley.
- The magnetic force locks the clutch disc and hub assembly and the A/C clutch pulley together as one unit, causing the compressor shaft to rotate.
- When battery positive voltage is removed from the A/C clutch field coil, springs in the clutch disc and hub assembly move the clutch disc away from the A/C clutch pulley.