The air conditioning (A/C) compressor control module controls
the operation of the compressor clutch in response to the signals received
from the following components:
| • | The A/C refrigerant pressure switch |
| • | The refrigerant (evaporator) temperature sensor |
| • | The powertrain control module (PCM) |
With the A/C system in operation the A/C compressor control module performs
the following functions:
| • | 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 |
| • | De-energizes the compressor clutch in response to the following
conditions: |
| - | 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 low evaporator temperature signal from the refrigerant (evaporator)
temperature sensor |
| - | A high engine demand signal from the PCM |
| - | An A/C system OFF request |
