Question about 2003 Chevrolet Impala
Engine overheats because fans do not kick on
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Posted on Jan 02, 2017
SOURCE: van chevrolet venture 2000
Fifteen minutes! you have bigger problems than only the fans the fans are controlled by a thermo switch that is heated by the coolant, If you have no coolant the sensor cannot activate But fifteen minutes seems like you may have a headgasket problem and steam cannot heat the coolant sensor.OperationNotesThe electric cooling fan operates when the engine cooling temperature exceeds a certain value. The cooling fan on this engine is controlled by the Powertrain Control Module (PCM) . The PCM turns the cooling fan ON by grounding the coil of the cooling fan relays when certain conditions are met. When the A/C is requested, the cooling fan will also be turned ON.
Power for the cooling fan motors are supplied through Maxifuses(R). The cooling fan relays are energized when current flows from the fuses in the Underhood Accessory Wiring Junction Block, and through the relay coils to ground through the PCM. The Coolant Fan 1 Relay Control Circuit is grounded for low speed fans operation. During low speed fans operation, both fans run at a slow speed. The Coolant Fan 1 Relay Control Circuit is grounded for high speed operation. During high speed fans operation, both fans run at high speed.
IMPORTANT: When certain Diagnostic Trouble Codes (DTCs) are present, the PCM may command the cooling fans to run all the time. Perform the A Powertrain On Board Diagnostic (OBD) System Check prior to diagnosing the engine cooling fans.
For more information regarding the Charging System, refer to Charging System Description , and Charging System Circuit Description in Starting and Charging.
If a problem that involves the low speed cooling fan relay control circuit exists, DTC P0480 Cooling Fan Relay 1 Control Circuit should set. If the problem affects the high speed cooling fan relay control circuit, DTC P0481 Cooling Fan Relay 2 Control Circuit should set. A problem with the ECT sensor should set DTC P0117 Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage, DTC P0118 Engine Coolant Temperature (ECT) Sensor Circuit High Voltage, DTC P1114 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage, DTC P1115 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage. Any of these DTCs will affect cooling fan operation and should be diagnosed before using the Electric Cooling Fan Diagnosis.
For more information regarding the Cooling System refer to Engine Cooling Fan Description - Electric, and Cooling System Description in Cooling System.
Here is the electrical schematic and how it all is suppose to work,
If you need any further help please contact me Thank you,Randy If you find this information helpful please give me a good rating
Posted on Aug 16, 2008
you have a burnt fan relay...if it were my car i ould run a jumper to the fuse panel so that when you turn the key on the fan will also come on and run.its not hard to do and it will stop the car from overheating
Posted on Jan 24, 2009
SOURCE: Radiator fan relay location
the relay will be located in the power distribution box under the hood. your owners manual will tell you which one it is if it is not clearly marked
Posted on Apr 18, 2009
SOURCE: PO481 code Chevy IMPALA 2003
Looked it up in Chilton's, confirmed in http://www.obd-codes.com/trouble_codes/
P0481 Cooling Fan 2 Control Circuit Malfunction
Each fan will throw a different code. See 3 fans listed for your model. Here's a link for the wiring schematic: http://www.chiltonlibrary.com/content/images/WD/GM/014/WD_GM_014788.pdf
Best of luck.
Posted on May 23, 2009
Check the coolant temperature sensor, it may have dirty contacts which is an easy job to fix. Signal from the coolant sensor indicates to the ECM that the engine is at running temperature and for the ECM to reduce the amount of fuel from the injectors (always a rich mix when warming up). (A little while later the thermostat should open allowing hot coolant to flow via the top hose to the radiator) The ECM rthen triggers the (5 pin) relay and the fans then come on. Check also the coolant relay fuse.
Posted on Jul 22, 2010
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