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Coolent fan wont come on unless you have the ac on what could be the problem.

Got hot while ideling in parking lot the cooling fan was not running but it would come on if you turned the ac on.

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  • Jeep Master
  • 75,066 Answers

Are you sure the fan is a problem?. it is only turned on when the engine reaches 225+ degree's F, so it seldom runs.

Posted on Oct 31, 2012

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

MrRodneyLong
  • 55 Answers

SOURCE: 92 accord radiator fan not working

the sending unit has went bad. it comes on with the ac because it designed to overide the high temp sending unit or switch. should cause less then 50 bucks to get it replaced and only a few bucks if you do it yourself

Posted on Jul 22, 2008

Tech Jenkins
  • 359 Answers

SOURCE: 2001 chevy malibu- when car starts cooling fans do not come on but then do

your coolant temp sensor on the engine block is probably faulty, however, keep in mind that if it really isn't all that hot outside they may not need to turn on. Once you activate the A/C the fans come on automatically since they have to cool the condensor...

If your car is not overheating do not worry about it.

Posted on Aug 29, 2008

michigan man
  • 3533 Answers

SOURCE: my cooling fan will not turn on 2000 ford contour

you need to replace the cooling fan because the resistor is in the cooling fan and it is best to go to a salvage yard and have them look it up on a computer and it will tell what fan will work on your car

Posted on Jan 12, 2009

mnabi01
  • 94 Answers

SOURCE: cooling fans on 2001 chevy malibu will not come on unless ac on

the relays control circuit is grounded by ECM (computer) . to check this make sure the is hot enough for the fans to be commanded on by computer and check to see if you have voltage at relay and it has ground from computer . you may need ECM.
good luck

Posted on Jan 28, 2009

  • 1129 Answers

SOURCE: 98 Saturn SL AC/cooling fan will NOT work

Do not let this car over heat a blown head gasket will ensue. Locate and replace the fan relay, if that doesn't fix the problem unplug fan and use jumper wires to ground the plug then feed power to the positive side of plug to check fan, if that doesn't work replace the coolant temperature sensor located somewhere near the intake manifold or thermostat housing area.

Posted on Jul 01, 2009

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Radiator fans do not come on unless A/C is on


Radiator fans come on only when engine reaches certain temperature or AC is switched on.

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My coolent fan turns off then car runs hot


I would check my relay's and or your fuses first. If thats not it, let it cool down and take it to Auto Zone or somewhere close to have a diagnostic readout done. Good luck.

Jul 29, 2014 | 2000 Ford Crown Victoria

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Engine cooling fan only works when ac or defrost is on


if engine at long stand still,the engine temperature will rise about 190 degrees the cooling fan suppose to automaticaly turn on when coolant temperature sensor get hot it cause its resistance decrease causing pcm to send power to coolant fan relays and cooling fans, when you turn on AC the cooling fans suppose to turn on to cool down AC CONDENSOR, IF NOT AC WONT WORK COOLING FAN COOLS DOWN REFRIGERANT SO IT CAN RECYCLE THROUGH THE SYSTEM AGAIN.your cooling is suppose to turn on when engine at a sit still if vechicle not moving as coolant temperature rises at a set point the cooling fans will turn on cool down engine.cooling fans dont turn on when you first cold stsrt vechicle unless you have AC SWITCH ON.if cooling fans dont turn on when vechicle at a long stand still or moving along slow traffic.if coolant temperature sensor been replaced and fuses and relays okay have dealership check see if pcm driver circuit working faulty pcm will cause cooling fans not to turn on.

Sep 27, 2012 | 1996 Buick Century

1 Answer

How did you know when the cooling fans are not working


You may have one conventional belt-driven fan with a thermal clutch and the other electric or, both could be electric on your car.
The cooling fan that operates during non-AC operation (just a running engine) if electric, will be controlled by a thermal switch in the lower radiator tank and may not turn on at all unless the engine is warmed up. The belt-driven fan should be turning at some speed all the time if the engine is running and at much higher speed with a hot engine.
The fan that cools mostly when the AC is operating won't run under normal operation but may turn on in hot weather (or when the engine is under heavier loads) even without the AC operating.
Checking them would require having a warmed-up engine and the AC turned on. Both fans regardless of type should be turning then.

Jun 03, 2011 | 2000 Mercury Cougar

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My cooling fans do not come on unless the AC is on, and they don't run very fast


the fan speed is variable to save fuel, the fans don't run unless the engine gets really hot, about 230 F, that is well past the middle of the gauge if u havce one, so the fact they run with the AC on means the system is almost certainly functional as long as u are not showing an engine overheat, are U?

Jun 05, 2010 | 1997 Oldsmobile Aurora

1 Answer

I have changed everythimg


i had the same problem and the mechanic told me it was the fan motor. They replaced the motor and it stopped running hot unless I have to set in an idle mode. I turn on the AC and it stops running hot. The fan from the AC cools the motor. Hope this helps.

Feb 14, 2010 | 1997 Saturn SL

1 Answer

The car was fine the temp never got over 180 i was racing and then park the car. i saw fluid leaking found out it was a bad cap. put a new cap and thermostat in and now the car is getting over 230 the fan...


you never bled the air out of water jaket did you? you just filled it back with water and run the motor up,
you have an air lock in the coolent system,,,bleed it out,,, if this new thermostat never had a small hole in the top of it the air cant get out past the thermostat,,, and you cook the motor?

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my 1990 325i bmw is running hot
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Sep 16, 2009 | 2001 BMW 325

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