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:
Front Wheelhouse Liner Replacement (Rear)
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Front Wheelhouse Liner Replacement
Callout
Component Name
Preliminary Procedure
Remove the tire and wheel assembly. Refer to Tire and Wheel Removal and
Installation.
1
Front Wheelhouse Rear Li ...
Front Floor Console Extension Replacement - Right Side
Front Floor Console Extension Replacement - Right Side
Callout
Component Name
1
Front Floor Console Extension
Procedure
Use a flat bladed plastic trim tool in order to release the retainers
securing the extens ...
Turbocharger Wastegate Regulator Solenoid Valve Replacement
Charge Air Bypass Regulator Solenoid Valve Replacement
Callout
Component Name
Preliminary Procedure
Disconnect the radiator outlet hose from the water inlet. Refer to
Water Inlet Replacement.
1
T ...
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