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2005 Chevrolet Impala, Fans not turning fast enough to cool the vehicle.

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You need to replace the the fan motor if eletrical. if electrical it could be a sending unit or switch.

If its a mechanical fan one that runs off the engine it needs to replaced.

Posted on Dec 31, 2008


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I have a 2005 uplander, the fans operate periodically when they should not. Have changed one senser.

How do you know when the fans should or should not work ? The PCM - engine control module tells the fans when to work . A coolant temp. sensor inputs coolant temp info to the PCM . Fans can come on when the vehicle isn't running , depending on temp. The cooling fans are turned on by the PCM using three relays . You best bet would be to take your vehicle to a qualified repair shop . Relay Driven Dual Cooling Fan Diagnostics

Dec 19, 2016 | 2005 Chevrolet Uplander

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Why does my 05 tahoe cooling fans operate randomly?

I'm not sure of the location on your vehicle but, normally mounted somewhere on the radiator, there is a TEMPERATURE SWITCH, which activates the cooling fans. If this switch is failing, it will activate the fans, as if the vehicle is hot.
On the other hand, if your garage reaches 120+ degrees, the fans WILL turn on.

Jul 21, 2014 | 2005 Chevrolet Tahoe

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Where is the relay located for cooling fan of 2005 chevy suburban

in the 2005 suburban, the cooling fans will stay on after the vehicle is off if it is too hot to try and cool down the engine

May 17, 2012 | 2005 Chevrolet Suburban

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2005 chevy impala ss. car is overheating every time i stop. any suggestions for figuring out what the problem is?

Sounds like you have an electric cooling fan issue. Driving down the road will supply air to the radiator. When stopped the cooling fan supplies the air. Possible problems would be: cooling fan motor, fan relay, fuse, ECT (electronic coolant temp sensor). Check these parts first.
Best Wishes TJ

Jul 29, 2011 | 2005 Chevrolet Impala

1 Answer

2003 Chevy Impala, running hot. Changed fan shroud because cooling fan wouldn't turn on, switched out fan relays, no check engine light. Cooling fan still will not turn on.

Would turn the key on no need to start it and unplug the ect engine coolant temp sensor. If fans come on then suspect a faulty etc which may not turn on the engine light. Which engine is in the vehicle so I can help locate the ect which is usually by the thermostat housing.

Jun 12, 2011 | 2003 Chevrolet Impala

1 Answer

Car runs hot

If it was the thermostat, it would run hot all the time. Sounds more like the electric cooling fans are not working. Either the fans themselves are not working, or the coolant temperature sensor is bad and not sending a signal to the computor to turn them on. Have the fans checked first, then go for the sensor if it isn't the fans.

Apr 11, 2010 | 2003 Chevrolet Impala

1 Answer

My radiator fans don't come on unless the AC is on what do you think would cause that?

Most people think that the fans should be running all the time . This is not so. The fans turn on when the motor reaches a certain temperature this will cool the engine down then they will turn off then back on again as the motor heats up. M.ost vehicles will automatically actuate the fan motors when you turn on the a/c and keep them running while the a/c is on .This is normal. Try idling your vehicle for about thirty to fourty minutes and see if within that time your fans dont come on and turn of automatically without the a/c on.

Nov 15, 2009 | 2004 Chevrolet Impala

5 Answers

Replaced waterpump, still overheating lights comes on

Check to see if there is water in the oil...If there is water in the oil then it could have a head gasket problem..Did you ever replace the thermostat? If it is stuck then it would also cause overheating...Excessive exhaust backpressure because of a clogged catalytic converter could also cause overheating..Also check belt tension and condition. A loose belt that slips may prevent the water pump from circulating coolant fast enough and/or the fan from turning fast for proper cooling...Another thing it could be is a faulty Water pump -- Any wobble in the pump shaft or seepage would call for replacement. In some instances, a pump can cause an engine to overheat if the impeller vanes are badly eroded due to corrosion or if the impeller has come loose from the shaft. The wrong pump may also cause an engine to overheat. Some engines with serpentine drive belts require a special water pump that turns in the opposite direction of those used on the same engine with ordinary V-belts... Also check the Fan -- With mechanical fans, most overheating problems are caused by a faulty fan clutch, though a missing fan shroud can reduce the fan's cooling effectiveness by as much as 50% (depending on the fan's distance from the radiator) which may be enough to cause the engine to overheat in hot weather or when working hard.

Mar 18, 2009 | 2005 Chevrolet Impala

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