For 1990-2009 cars

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

• | The A/C ON/OFF switch

• | The A/C refrigerant pressure switch

• | The Powertrain Control Module (PCM)

With the air conditioning system in operation, the A/C compressor control module performs the following functions:

• | Energizes the compressor clutch in response to the following:

- | An A/C system ON request

- | The determination of favorable system conditions for air conditioning operation.

• | De-energizes the compressor clutch in response to the following:

- | An A/C system OFF request

- | A high refrigerant pressure signal (from the A/C refrigerant pressure switch)

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

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