Air Conditioning

AIR CONDITIONING

The air conditioning system components are the following:
- A/C compressor
- A/C condenser core
- A/C evaporator core
- Receiver/drier cartridge
- Connecting refrigerant lines
- Thermostatic expansion valve
- Evaporator discharge air temperature sensor
- A/C high-pressure cutoff switch
- Low charge protection switch
- A/C compressor pressure relief valve

The refrigerant system incorporates an A/C compressor controlled by the powertrain control module (PCM) through an A/C clutch relay.

The A/C compressor clutch will only be engaged by the PCM if all of the following conditions are met:
- The climate control assembly is set to a mode which provides an A/C request to the PCM.
- The evaporator discharge air temperature sensor is reading a temperature above 3°C(37°F).
- The A/C pressure transducer is not reading an excessively high or excessively low pressure in the refrigerant system.
- The A/C compressor relay is switched to the CLOSED position by the PCM.
- The engine coolant temperature is not excessively high.
- The PCM has not detected a wide open throttle (WOT) condition.

Refer to Heating and Air Conditioning for operating specifications.

An A/C compressor pressure relief valve is installed in the A/C compressor to protect the refrigerant system against excessively high refrigerant pressure.

Refrigerant flow into the evaporator core is metered by a thermostatic expansion valve.