Chevrolet Sonic manuals

Chevrolet Sonic Repair Manual: Cooling Fan Description and Operation (LWE, LUW)

Chevrolet Sonic Repair Manual / Powertrain / Engine / Engine Cooling / Radiator Fan / 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:

Engine Overheating
The vehicle has an indicator to warn of the engine overheating. If the decision is made not to lift the hood when this warning appears, get service help right away. See Roadside Assistance Program. If the decision is made to lift the hood, make sure the vehicle is parked on a level surface. T ...

Drivetrain and Front Suspension Frame Replacement
Special Tools EN-45059 Angle Meter For equivalent regional tools, refer to Special Tools. Removal Procedure Support the radiator and condenser from above using the upper brackets on each side. Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle. Re ...

Alternative routes
Applies to: vehicles with navigation system Fig. 152 Alternative routes in the overview map Opening alternative routes Requirement: route guidance must be started and the map must be displayed Press on in the side menu on the map fig. 149. Current route The distance to the destination and ...

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