Compressor Clutch: Description and Operation

A/C Compressor and Clutch Assembly

NOTE:
- Internal A/C compressor components are not repaired separately. The scroll compressor is serviced only as an assembly. The A/C clutch, A/C clutch pulley and A/C clutch field coil are serviceable.
- Installation of a new suction accumulator is not required when repairing the air conditioning system except when there is physical evidence of system contamination from a failed A/C compressor or damage to the suction accumulator.

The Visteon Variable Scroll Compressor (SCV90) has the following characteristics:
- A variable capacity function controlled by a suction pressure sensing device.
- A fixed and orbiting scroll to provide refrigerant compression.
- A non-serviceable shaft seal.
- An A/C compressor that uses PAG oil. This oil contains special additives required for the A/C compressor.

Compressor Clutch Components:

The Visteon SCV90 compressor contains a thermal cutout switch which senses the compressor housing temperature.The switch will disengage the compressor clutch if the housing temperature exceeds 120°C (247°F)

The Visteon (SCV90) magnetic A/C clutch has the following characteristics:
- It drives the compressor shaft.
- When battery positive voltage (B+) 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 B+ 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.