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:
Toe Description
Toe is a measurement of how much the front and/or rear wheels are turned in or
out from a straight-ahead position. When the wheels are turned in, toe is positive (+).
When the wheels are turned out, toe is negative (−). The actual amount of toe is
normally only a fraction ...
Engine Coolant Temperature Sensor Replacement (Radiator)
Engine Coolant Temperature Sensor Replacement - Radiator
Callout
Component Name
Preliminary Procedures
Drain the cooling system. Refer to Cooling System Draining and Filling.
1
Retaining C ...
Piston, Connecting Rod, and Bearing Cleaning and Inspection
Special Tools
EN-470-B Angular Torque Wrench
For equivalent regional tools, refer to Special Tools.
Visual Inspection And Cleaning Procedure
Connecting Rod
Warning: Wear safety glasses when using compressed air in
order to prevent eye injury.
Clean the connecting rod ...
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