A/C Compressor W/HP5

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The A/C compressor uses electric driven air conditioning compressor that busses power directly from 300 volt hybrid battery. The compressor is a 3-phase electric motor that runs on 300 volts alternating current. The compressor uses Polyol Ester (POE) oil, which attracts less moisture. The AC compressor function is to provide refrigerant flow in the AC refrigerant loop to help cool down the cabin and to help dehumidify the air in a defrost mode. The AC compressor shall be activated when the customer or when in AUTO mode requests the electric AC compressor on to help in cooling the cabin or removing moisture in the defrost mode.

The HVAC control module uses values from the A/C pressure transducer, duct temperature sensors, ambient air temperature sensor, passenger compartment temperature sensor and evaporator temperature sensor to determine the speed at which the compressor will operate. This message is send from the HAVC control module to the A/C compressor control module via GM LAN message.