Chevrolet Sonic Repair Manual: 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 resistors. This combination of components enables the ECM to operate the cooling fan at 3 speeds using two fan control circuits.
Low Speed Operation
The ECM applies ground at the FAN 1 control circuit for the coil side of the cooling fan relay. The energized cooling fan relay completes a ground, through the switch side of the relay, for the coils of the cooling fan low speed relay and the cooling fan speed control relay. The speed control relay activates and supplies B+ to the coil side of the cooling fan high speed relay. The high speed relay remains inactive because the ECM is not commanding the FAN 2 control circuit ON. The energized low speed relay switch closes to supply B+ through the internal low speed resistor of the engine cooling fan motor. The result is cooling fan operation at a reduced speed.
Medium Speed Operation
The ECM applies ground at the FAN 2 control circuit for the coil side of the cooling fan high speed, and medium speed relays. The high speed relay remains inactive because the ECM is not commanding the FAN 1 control circuit ON. The energized medium speed relay switch closes to supply B+ through the internal medium speed resistor of the engine cooling fan motor. The result is cooling fan operation at a medium speed.
High Speed Operation
The ECM applies ground at the FAN 1 control circuit for the coil side of the cooling fan relay. The energized cooling fan relay completes a ground, through the switch side of the relay, for the coil of the cooling fan speed control relay. The energized speed control relay switch closes to supply B+ to the coil side of cooling fan high speed relay. Simultaneously, 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 fans internal resistors. The result is cooling fan operation at full speed.
Radiator Fan
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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
1̴ ...
Other materials:
Storing an SiriusXM Channel
Drivers are encouraged to set up XM channel favorites while the vehicle is not
moving. Tune to favorite stations using the pushbuttons, favorites button, and steering
wheel controls. See Defensive Driving.
A maximum of 36 stations can be programmed as favorites using the six pushbuttons
posit ...
Rear Side Door Window Regulator Handle Replacement
Rear Side Door Window Regulator Handle Replacement
Callout
Component Name
1
Rear Side Door Window Regulator Handle Clip
Procedure
Use the appropriate tool, remove the clip from handle.
2
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Engine Coolant Thermostat Housing Removal
Caution: Refer to Engine Coolant Thermostat Housing Caution.
Remove the engine coolant thermostat housing retainer nut (4).
Remove the engine coolant thermostat housing retainer (1).
Remove the 4 engine coolant thermostat housing bolts (3).
Remo ...
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