Air Conditioning (A/C) Compressor Control Module Description. Pontiac Sun Runner - 4WD (Canada) 1998

For 1990-2009 cars

The A/C compressor control module controls the operation of the compressor clutch in response to the signals received from the following components:

1. The A/C ON/OFF switch
2. The A/C refrigerant pressure switch
3. The evaporator temperature sensor
4. The powertrain control module (PCM)

The A/C compressor control module performs the following functions when the air conditioning system is operating:

1. Energizes the compressor clutch in response to the following conditions:

- | An A/C system ON request

- | The determination of favorable system conditions for A/C operation

2. De-energizes the compressor clutch in response to the following conditions:

- | A high refrigerant pressure signal from the refrigerant pressure switch

- | A low refrigerant pressure signal from the A/C refrigerant pressure switch

- | A low evaporator temperature signal from the evaporator temperature sensor

- | A high engine coolant temperature signal from the engine coolant temperature sensor (ECT)

- | A high engine demand signal (WOT) from the PCM

- | An A/C system OFF request