Question about 2000 Oldsmobile Alero

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Cooling fans don't turn on when car gets hot

Can you tell me how to fix that problem , the fans have already been replaced and also so has the thermostat.

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  • redeyes Oct 12, 2008

    can you tell me where the relays are ?thank you

  • unclebasil2 Oct 29, 2008

    fans turn on when the temperature sensor is unplugged. all three fan relays were changed as also the temperature sensor but fans won't turn on when temperature reaches halfway mark on dash.the fuses were also checked and are fine.

  • Anonymous Dec 15, 2008

    I have the same problem but I normally just just turn on my heat and the engine cools down.

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Have you tried replacing the relay to the fans they somtimes burn out

Posted on Oct 11, 2008

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Car gets hot pretty quick and will overheat, noticed fans arent coming on when car is hot or if I turn a/c on. Have caught them running recently but didnt catch it again.


it could be the cooling fan relays or possibly the cooling fans. to check the fans disconnect the plug at the fans and run jumper wires to them both power and ground. if they don`t work then the fans are bad. check voltage and grounds at the plugs when they should be running, if they are good then the wiring is good. it could also be the coolant sensor for the fans that send the signal from the sensor to the computer so it knows when to turn on the fans. the fan that runs with the A/C when turned on could be the A/C relay.

Sep 10, 2015 | 2003 Dodge Intrepid

2 Answers

98 civic ex coupe. Car runs really hot. Replaced radiator, thermostat & gasket, water pump & timing belt, numerous hoses. Car doesnt leak & has had a leakdown test & pressure tests, passed...


it could be a possibility that the engine is running at normal temperature but your gauges are telling you that it is running hot the only way to tell is to get a temperature gauge & connect it into the water system somehow to give you an accurate reading or take the vehicle to a radiator repairer & they may be able to do it for you..........hope this helps.....cheers.

Sep 23, 2011 | 1998 Honda Civic

1 Answer

Radiator fans not working car is running hot.


Turn vehicle off. Allow to cool. Raise hood.
Try to see if the fans spin freely by hand. If not, replace. If they do spin, proceed to next step.
Next step-
Check coolant level, add if needed. Remember-radiator must be cool before opening cap. Make sure radiator cap is secure and tight if coolant was added.
Start vehicle. Observe coolant gauge as vehicle warms. Fans should come on when temp gauge reads halfway between c and h.
If fans do not come on see if they come on when you turn on ac or heat. If doing this makes them come on, suspect faulty cooling fan sensor switch. If they don't come on replace cooling fan sensor switch and fan relay.

Aug 30, 2011 | 1989 Nissan Maxima

2 Answers

I have a 2004 Pontiac Sunfire. When the car is in idle the air blows out hot and the Temperature gage rises and the car over heats. When the car is moving the air blows out ice cold and the temperature...


Sounds like your cooling fans on the radiator are not working. The fans are activated by a thermol switch on the engine or radiator reading the coolant temperature and an A/C switch. When the coolant is too hot the fans should activate cooling the system down. And, when the A/C is on the fans should also activate in order to cool the condensate so the A/C would work.

When you are driving, the movement of the vehicle throught he air is providing enough air flow to keep things cool and functional.

I would check the radiator fan fuse or fuses first. If those are OK I would try to run the fans with 12 volts and a ground that I supply just to see if the fan motor(s) actually run when powered. If the fan don't run when powered then the fans are bad and will need to be replaced. If the fans do run when you power them manually, then something is not allowing the power to activate, like a relay, control unit, or wiring.

It will take a little diagnostics, but it is not too difficult to chase it down.

May 03, 2011 | Pontiac Sunfire Cars & Trucks

2 Answers

My 2001 Sebring blows hot air except when I turn the control knob to defrost, then it blows cold air and the condenser fan kicks on . Chrysler has already replaced the evaporator core and that did not fix...


If the ac is turned on and it comes threw the defrost,then it is not the cooling fans,but check them to see that they are coming on,and they are turning fast,the control head is more likely the problem.

Jul 27, 2010 | 2001 Chrysler Sebring

1 Answer

Gets really hot before fan comes on,rite to the red line.


the temp sensor for the fan is going bad assuming the car cools down after the fan comes on and stays cool intil the fan turns off again. replacing it should fix your problem.

Jun 04, 2010 | 1991 Geo Metro

1 Answer

2 fans right behind radiator don.t rotate, what's wrong and how to fix ?


those fans can cost allot of money unless you get it used or off ebay or junkyard, I would first check the fuse and the cooling fan relay making sure its not faulty next also replace your temperature sensor, what it does it sense the temperature of your coolant in the engine and when it reach certain tempature it send information to the computer telling it to turn on the fan to cool down the engine down. its fairly cheap and it take 2 minute to replace; if the sensor is faulty the fan will not turn on automatically. next if you did everything and the fan still does not work You can pull the fan out and test it buy direct contact using some spare wire wires and touch it straight to the battery to the fans plug. it hard to believe both fans fail at the same time. keep in mind both fan work in sync, although the 2nd fan is only a back up help to cool the engine while AC is running.

Sep 27, 2009 | 1993 Chevrolet Lumina

1 Answer

Is the radiator fan the same as the cooling fan?


The cooling fan is used to cool the radiator.
There is a sensor that turns the fan 'on' if the radiator gets too hot. A light comes 'on' to tell you the fan is 'on'.

If the fan ran all night the sensor is bad and the (sorry for the pun) the idiot light is on to tell everyone something is wrong and it needs service.
DON"T run your car with out the fan!

Jun 23, 2009 | 2005 Chrysler Town & Country

1 Answer

Overheating when at stop or traffic


CARS THAT USE ELECTRIC FANS HAVE A THERMOSTATIC SENSOR THAT TELLS THE FAN OR FANS WHEN TO COME ON BASED ON THE COOLANT TEMPERATURE. THIS SENSOR HAS GONE BAD. WHEN THE AC IS TURNED ON IT BYPASSES THIS SWITCH AND RUNS TO KEEP THE CAR COOL, BUT BY THE TIME YOU TURN THE AC ON THE CAR HAS BECOME TOO HOT ALREADY. YOU NEED TO REPLACE THE THERMOSTATIC SENSOR. THEY CAN BE A LITTLE PRICEY, BUT NOT A WALLET BUSTER.

Jan 24, 2009 | 2001 Ford Focus

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