Radiator Cooling Fan Motor: Description and Operation

DESCRIPTION
The electric drive cooling fan system consists of a fan and a two-speed electric motor. The cooling fan is controlled during engine operation by the Electronic Control Module (ECM) through the Integrated Relay Control Module (IRCM).

OPERATION
The ECM sends a signal to the IRCM to control the cooling fan under the following conditions.

- Coolant temperature increases to 215°F, the Low Speed Electo-Drive Fan (EDF) circuit is turned on.

- Coolant temperature increases to 230°F, the High Speed Electro-Drive Fan (HEDF) circuit is turned on.

- Coolant temperature lowers to 224°F, the HEDF is turned off and the EDF is turned on.

- Coolant temperature lowers to 210°F the EDF is turned off.

- A/C is on and the vehicle speed is below 43 mph, the EDF is turned on.

NOTE: The cooling fan does not cycle with the A/C