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:
Safety Belts
This section of the manual describes how to use safety belts properly. It also
describes some things not to do with safety belts.
Warning
Do not let anyone ride where a safety belt cannot be worn properly. In a crash,
if you or your passenger(s) are not wearing safety belts, injuries can be mu ...
Passenger Sensing System
The vehicle has a passenger sensing system for the front outboard passenger position.
The passenger airbag status indicator will light on the instrument panel when the
vehicle is started.
United States
Canada
The words ON and OFF, or the symbol for on and off, will be visible during the
...
How to Inspect the Engine Air Cleaner/Filter
To inspect the engine air cleaner/ filter, remove the filter from the vehicle
and lightly shake the filter to release loose dust and dirt. If the filter remains
covered with dirt, a new filter is required.
To inspect or replace the air cleaner/ filter:
1.4L L4 Engine
1.8L L4 Engine
1. Re ...
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