Legend Sedan V6-3206cc 3.2L SOHC FI (1995)
Radiator Cooling Fan Motor: Description and Operation
Climate Control
The A/C ON input at cavity (A3) of the fan control unit is grounded through the A/C triple pressure switch and the climate control unit at G303. The fan
control unit supplies two input signals to the powertrain or engine control module (PCM) with A/T or (ECM) with M/T. It indicates that the A/C system
has been turned ON and that the engine idle speed must be increased.
The fan control unit and the PCM/ECM are grounded at the (PDSW) terminals through the middle pressure switch in the A/C triple pressure switch at
G153.
When the ignition switch is in ON (II), the PCM/ECM energizes the A/C compressor clutch relay by providing a ground for it. The compressor clutch is
then energized through fuse 3, and the closed contacts of the clutch relay.
The fan control unit uses the radiator fan control sensor to measure the engine's coolant temperature:
^
When the radiator's coolant temperature is above 84°C (183°F), both the condenser and radiator fans will run at low speed.
^ When the radiator's coolant temperature is above 90°C (194°F), the fan control unit causes both fans to run at high speed.
^ When the radiator's temperature exceeds 109°C (268°F), the fan control unit, through the PCM/ECM, deenergizes the clutch relay and the
compressor clutch.
When the refrigerant pressure becomes too high (due to blockage), or too low (due to leakage), the A/C triple pressure switch will open. This prevents
the clutch relay and compressor clutch from energizing.
The radiator fan control sensor will disengage the air conditioning system if the coolant temperature exceeds 110°C (230°F).
