Tracker 4WD L4-2.0L VIN C (1999)
Control Module HVAC: Description and Operation
A/C COMPRESSOR CONTROL MODULE
The A/C compressor control module controls the operation of the compressor clutch in response to the signals that are received from the following
components:
^
The A/C ON/OFF switch
^
The A/C refrigerant pressure switch
^
The evaporator temperature sensor
^
The Powertrain Control Module (PCM) The A/C compressor control module performs the following functions when the air conditioning system is
operating:
^
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 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 demand (WOT) signal from the PCM
-
An A/C system OFF request
-
An engine coolant temperature over 110°C (230°F)
