Question about 2005 Chevrolet Impala

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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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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.


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Jun 12, 2011 | 2003 Chevrolet Impala

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Car runs hot


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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

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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

1 Answer

Cooling fan problem


The electric fans on some vehicles dont stay on all the time. If the radiator is not burningyou then i would suspect the guage is bad. The engine would throw a code if the fan was not working properly, so im pretty sure that your fan is working properly. I hope that helps you out.

Nov 21, 2008 | 2005 Chevrolet Impala

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