Chevrolet Sonic Repair Manual: Cooling Fan Description and Operation (LWE, LUW)
System Overview
The engine cooling fan system is composed of one cooling fan, 2 relays, the engine control module (ECM), and the associated wiring. The cooling fan assembly includes 1 resistor mounted in the cooling fan shroud. The cooling fan resistor may be a stand alone component, or a part of the cooling fan motor and harness assembly. This combination of components enables the ECM to operate the cooling fan at 2 speeds using two fan control circuits. The ECM will operate the cooling fan at either Low or High speed based on the cooling requirements.
Low Speed Operation
The ECM applies ground at the FAN 1 control circuit for the coil side of the low speed cooling fan relay. The energized low speed relay switch closes to supply B+ through the cooling fan resistor, to the engine cooling fan motor. The result is cooling fan operation at a reduced speed.
High Speed Operation
The ECM applies ground at the FAN 2 control circuit for the coil side of the cooling fan high speed relay. The energized high speed relay switch closes to supply B+ directly to the engine cooling fan motor, by-passing the cooling fan resistor. The result is cooling fan operation at full speed.
Cooling Fan Description and Operation (LUV)
The engine cooling fan system is composed of one cooling fan, a series of 5 relays,
the engine control module (ECM), and the associated wiring. The cooling fan assembly
includes two resistor ...
Engine Coolant Fan Shroud Replacement (LDE LUW)
Engine Coolant Fan Shroud Replacement
Callout
Component Name
Preliminary Procedure
Remove the radiator surge tank. Refer to Radiato ...
Other materials:
Brake Shoe Replacement (J93, J94)
Removal Procedure
Warning: Refer to Brake Dust Warning.
Note: Always replace brake shoes in axle sets.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
Remove the tire and wheel assembly. Refer to Tire and Wheel Removal
and In ...
Clutch and Differential Housing Assemble
Special Tools
R-0007761 Universal Handle for Pullers and Installers
R-0407009 Countershaft Front Bearing Driver
R-0407010 Input Shaft Needle Bearing Puller and Driver
R-0407014 Gearshift Device Bushing Driver ?E#8201;Use with R-0007761
S-9707500 Axle Shaft Seal Installer
Fo ...
Front Wheel Drive Intermediate Shaft Replacement
Front Wheel Drive Intermediate Shaft Replacement
Callout
Component Name
Preliminary Procedure
Raise and support the vehicle. Refer to Lifting and Jacking the
Vehicle.
Remove the wheel drive shaft assembly from the vehicle ...
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