LeSabre V6-3.8L VIN K (1996)
Radiator Cooling Fan Motor: Description and Operation
Circuit Operation
The Powertrain Control Module (PCM) controls both cooling fans by controlling two relays through two outputs. There are two modes of cooling fan
operation: low speed and high speed. Whenever the PCM provides a fans ON request signal, both fans run.
Low Speed Operation
Low speed cooling fan operation occurs when the PCM grounds the low speed cooling fan coil on DK GRN (335). The relay energizes and applies
voltage to both the LH and RH cooling fan motors. Power is supplied to the motors through RED (742), the low speed cooling fan relay contacts,
LT BLU (409) and BLK (1150) to ground G104.
High Speed Operation
The cooling fans run at high speed when the PCM grounds the high speed cooling fan relay on DK BLU (473). The relay energizes and applies
voltage to both the LH and RH cooling fan motors. Power is supplied to the LH motor through BLK (532), the high speed cooling fan relay
contacts, and BLK (1150) to ground G104. Power is also supplied to the RH cooling fan motor through BLK (532), the internal resistors of the LH
cooling fan motor, LT BLU (409) and BLK (1150) to ground G104.
