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:
Bluetooth (Overview)
For vehicles equipped with Bluetooth capability, the system can interact with
many cell phones, allowing:
Placement and receipt of calls in a hands-free mode.
Sharing of the cell phone’s address book or contact list with the vehicle.
To minimize driver distraction, before driving, and w ...
Transmission Case Cleaning and Inspection
Transmission Case Cleaning and Inspection
Callout
Component Name
Caution: Do not use abrasive pads or bristle devices to clean
the sealing surfaces. Abrasive pads produce a fine grit that can effect
transmission func ...
Manual Transmission Shift Lever and Selector Lever Cable Replacement
Removal Procedure
Remove the battery tray. Refer to
Battery Tray Replacement.
\i
Disconnect the shift lever and selector cable ends (1)
from the transmission shift lever and selector levers.
Pull the cable retainers (2) to release the shift
leve ...
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