Compressor HVAC: Description and Operation

Features
- Engine mounted, driven by the accessory drive belt.
- Fixed displacement type.
- High-pressure relief valve, to avoid system over-pressure.
- ECM controlled clutch energized via a relay.

Compressor ON Signal
This signal monitors the compressor relay to confirm the compressor operating state and so provide relevant fault information.

ECM Override - Maximum Throttle or Low Temperature
The ECM will allow the compressor clutch to be engaged if the engine temperature and load demand are normal. Should the driver require maximum engine power or the coolant temperature be high, the request will be denied.