The V5 A/C System

The V5 variable displacement compressor combines with the thermal expansion valve to form a largely selfregulating system. In the high pressure refrigerant line, there is a pressure sensor rather than a traditional high or low pressure cut-off switch or pressure cycling switch. The compressor clutch is controlled by the Powertrain Control Module (PCM)/Engine Control Module (ECM), which monitors data from the various engine systems. The PCM/ECM will disengage the compressor clutch if the following conditions are detected:
- The air conditioning is OFF.
- The throttle is in the wide-open position.
- High engine coolant temperature.
- High engine RPM.
- Low refrigerant pressure.
- High refrigerant pressure.

The compressor clutch will remain disengaged until normal operation is established.