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Why does my radiator fan on my grand prix stay on even when car is shut off? I have to disconnect for it to stop running

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Sometimes these fans are made to run after the engine is shut off to dissipate residual heat. Will it shut off after 5 minutes on its own? If it continues to run after several minutes, then you need a new thermal switch in the radiator.

Posted on Feb 16, 2014

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Posted on Jan 02, 2017

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SOURCE: 95 grand am radiator fan only runs with AC on

Cooling Fan Temp Sensor is the First thing You Check (with what you have described) Cooling Fan Should ALways come On When The A/C is turned On as A/C Adds A Load to Engine, If Temp Sensor is Faulty it Will Not Give GROUND Signal to ECM >For COOLING FAN >RELAY to Give ground and turn ON The Fan.
There ARE 2 temp Sensors that Serve Different Purposes 1 is for Dash READING GAGE & Or TEMP LIGHT the Other is For ECM or Fan Relay (SAME Thing) you Said>""can disconnect the sensor and fan continues to run" < This Leads me to think you Changed the Wrong One. Not Questioning your Skills Just Here to Help.
TEMP SENSOR FOR 3.1L V6 is Located upper RH rear of engine compartment, near exhaust system. Temp SENSOR for 2.3L Engine is Located in LH rear of engine compartment.
I Hope this Helps Lead you to a NON-OVERHEATING Pontiac.
Good Luck and Have A Great Evening. rejakwilson

Posted on Feb 04, 2009

  • 90 Answers

SOURCE: 2001 Grand Am GT radiator fans will not run

Hi, where was the car loosing water from please?

Posted on Mar 24, 2009

BillB-SA
  • 2761 Answers

SOURCE: My 1999 Jeep Grand Cherokee Laredo radiator fan

There's a thermostatic switch that kicks the fan on and off. It is apparently shorted, causing the fan to run continuously. Check with your local auto parts store -- you be able to replace the switch without having to replace the entire fan assembly. In the meantime, pulling the fuse is a lot better than disconnecting the battery. You won't lose computer memory, clock, stereo memory, etc.

Posted on Oct 20, 2009

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It sounds like an alternator, yet you say the fan still worked after you disconnected the battery? And the car was still running? Or the car died out. Sorry, need some more details on this one.

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Replace thermostat


follow upper radiator hose to aluminum housing this is where the thermostat is. be sure engine is cool remove radiator cap or reservoir cap if no cap on radiator disconnect upper hose from thermostat housing. remove two bolts in housing and remove housing. replace thermostat and reassemble. when finished refill anti- freeze leave cap off and start vehicle with heat on high. run the vehicle like this until air stops bubbling out of coolant and heat is hot steadily. continue topping off coolant during this process and be sure cooling fans engage before completion. then youre all done

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2004 Pontiac Grand Prix is running warm about halfway. When I'm driving around it stays below half, but when I stop it heats up over half. then the fan turns on. Could this be a fan sensor? Is it not...


CHECK COOLANT LEVEL.IF COOLING FAN TURNING ON COOLANT TEMPERATURE SENSOR WORKING.BECAUSE IT CONTROLS AND TURN ON COOLANT FAN AT A SET TEMPERATURE.SOUND LIKE ENGINE RUNNING TOO HOT. HAVE RADIATOR FLUSHED.REPLACE THERMOSTAT. HAVE ENGINE BLOCK FLUSHED.REPLACE RADIATOR PRESSURE CAP ALSO.SEE WHAT HAPPENS.

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1998 grand prix gt blower motor stays running even when the car is turned off with keys out of the ignition. had to disconnect battery to stop it. not sure which fuse to pull because i have no diagram. any...


The blower should stay on for about 5minutes to cool the engine off. It isn't a problem unless it is running continuously after the engine is cooled.

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1 Answer

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Could be air in cooling system. Add antifreeze to cool radiator, run engine, cool, check level again, until completely full.

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1 Answer

My 2000 pontiac grand prixs fan will not shut off


Pull the relay in the fuse box or remove the connector on the temperature coolant sensor.These two items have to be tested as per the directions in the vehicle's shop manual. Furthermore the circuitry and the ECU must be tested as well. Good luck

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the blower motor resistor is probably the problem with the blower staying it,

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Have you checked the fan relay to make sure it hasn't burned internally and is now stuck on?

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