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 Pedal Pushrod Inspection
Disconnect the brake pedal pushrod (2) from the brake pedal.
Reposition the pedal pushrod boot (1) toward the front of the vehicle to
expose as much of the pedal pushrod (2) as possible.
Inspect the brake pedal pushrod (2) for straightness.
If the brake p ...
Control Valve Body Cleaning and Inspection (Gen 2)
Control Valve Body Cleaning and Inspection
Callout
Component Name
Warning: Valve springs can be tightly compressed. Use care
when removing retainers and plugs. Personal injury could result.
Caution: After cle ...
System temporarily unavailable
When any of the following messages appear on the vehicle information display,
a chime will sound and the I-BSI system will be turned off automatically.
"Unavailable Slippery Road": When the VDC system (except traction control
system function) or ABS operates.
"Currently Una ...
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