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Posted on Jul 30, 2008
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Cooling fan not working

Cooling fan not running when engine gets to temp. but both fans will turn on immediately if air conditioner is turned on. already changed engine temp sensor, primary cooling fan relay, all fuses are functional.

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  • 9 more comments 
  • wilbert muswere Aug 16, 2013

    cooling fans can only respond to temperature changes being the manipulation caused by the two pin fan temp sensor. what if u pullout the socket and the fans start condinuosly and when connected the fans remain silent even after the vehicle remin iddling for 30mins?

  • Anonymous Mar 12, 2014

    Fan is stll running after engine is turned off, will not turn off what should I do?

  • Anonymous Mar 19, 2014

    Fans only run when temp sensor is unplugged on 01. V.

  • Anonymous Mar 20, 2014

    engine light comes on when car is cranking up,the fans are not turning,but turn hen the air conditioner is on is this a relay problem,do i need to have the fuse changed out on the relay box.

  • Anonymous Mar 22, 2014

    ive changed fan two relays checked fuses

  • Anonymous Mar 24, 2014

    where the tem senor location to make cooling fans run right i know one fan come on before the oyher one

  • Anonymous Mar 28, 2014

    cooling fan only works when air conditioner or heater is running

  • Anonymous Mar 29, 2014

    cooling fan is not turn on
    cooling sensor i replaced ,relay and fan is working

  • Anonymous Mar 29, 2014

    how hot does the engine have to be before the cooling fan turns on, I got it to about 200 degrees and it did not turn on, could it be bad

  • Anonymous Mar 30, 2014

    Fans only operate when air conditioner is on

  • Anonymous Mar 30, 2014

    electric cooling fans do not operate no fuses blown fans work if direct wired where is sensor for fans located?

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Marvin

Marvin

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  • Pontiac Master 85,242 Answers
  • Posted on Aug 22, 2008
Marvin
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Joined: Jun 20, 2008
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The fans only run when the engine reaches approxminatly 235 degrees F. on the guage that is near the end of scale just before guage show "HOT" I don't think you have a problem, allot of folks out there don't know about this.

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Related Questions:

0helpful
2answers

My fan has Auto high and low then on low and high. Why does it only work on i of the fans
If you are referring to the fans both running when the A/C is on, if the high side of the system (condense temp) does not get to a certain temp calling for the second fan, it will not turn on. The single fan running without A/C would normally be for cooling the engine temp (antifreeze).
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Jun 14, 2019 • Cars & Trucks
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My 97 hyundai Accent I can drive it 100 miles and electric cooling fan doesn't come on ,doesn't get hot
Not necessarily. The vehicle, in motion, has enough air flow through the radiator that the fan is usually not needed. The fan will run if the vehicle sits and idles for a while and the coolant temp rises since there is no air flow through the radiator. If you are worried about fan operation, there are two things to check. The fans will ALWAYS come on if the A/C is turned on. That is because the fans pll air through the A/C coil in front of the radiator. Air must flow through that at all times or pressure in the A/C lines will get too high. So test that circuit simply by running the engine and turning on the A/C. If the fans run, that part works. Now turn the A/C off. Let the engine run until the temp gauge gets to around 200-220 degrees F. The fan should come on about this time and run until the temp drops to about 190. This cycle will continue to keep the coolant from getting too hot. If the temp gauge gets into the red area and the fan has not come on, shut down the vehicle immediately to prevent engine overheating, and then troubleshoot that portion of the fan circuit.
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Oct 23, 2015 • Hyundai Cars & Trucks
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Will a bad temp sensor make a car run hot
a temp sensor only monitors what the engine temp is it will not cause the engine to overheat or run hot. check to make sure the rad cooling fan is working if not it could be a bad fan motor, temp sensor for the computer to turn on the fan or a fan relay. there are 2 temp sensors on motors. one is for the gage or light the other is to tell the computer to turn on the cooling fan.
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Aug 23, 2014 • Mercury Marauder Cars & Trucks
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The fan wont work car does not get hot shut off
cooling fan works on a temp sensor in the engine block. it only turns on when the temp reaches a set limit and shuts off when it gets below a set limit.. cooling fan components are , fans, fan relay , and temp sensor . best way to test the fans would be to let the car set running and watch the temp till it goes up to 185 -195 deg. at this time the fans should turn on and the thermostat should open and cool the engine back down. also when ever the air conditioning is on so should the cooling fans be on. if the fans do not run the check all components till you find the broken one. fan relay and air conditioning relay are separate but work the same. and will interchange
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Dec 18, 2013 • 2001 Dodge Neon
1helpful
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2005 Chevy venture left and right fans do not run. Changed temp sensor next to thermostat. No change. Both fans will run when turning on air conditioner. When I turn of the air conditioner both fans
Just one sensor,the fans won't run until engine temp gets to about 230 tho.
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Apr 21, 2012 • Chevrolet Cars & Trucks
1helpful
1answer

The electric fan that cools my radiator is not running.
The radiator fan should come on when car reaches normal operating temp,With engine at Idle and temp normal feel the top radiator Hose ,it should be hot,If no then Engine coolant is not moving-cause could be an "Air lock" if that is the case,turn key off until it cools then disconnect top Hose and start engine,at normal temp,you should have Engine Coolant coming out,turn key off let engine cool;reconnect and refill with a 50/50 mix;

Back to the Fan problem;the Fan should come on when engine temp is normal,if not turn the Air-Conditioner on,radiator Fan should come on at any temp;two checks ,one is the Fan Relay ,located in the under Hood main power supply box;There will be 3 or 4 relays for different systems since they are of the same part number swap and see if problem is fixed;if no check the Fuse in same power supply box;You said fans spin so they are not locked up;Take an eight dollar D.C. circuit tester,they look like an ice pick with a clamp for ground attach,to ground and with the fan plug disconnected see if you have voltage; ,You can have a continuous fan by finding a wire close to the fan that has power when the key is in the on position,take a wire and attach to that wire;
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Jun 09, 2011 • Jeep Cherokee Cars & Trucks
5helpful
2answers

Why there are 02 fans near radiator? What are the purposes? One is working and one is not.
Hi and welcome to FixYa I am Kelly.
You have 2 fans because one is the temperature controlled radiator fan that only runs when the engine water temp is above 160 deg. F. The water termperature controlled fan can run even with the ignition key OFF should the Engine water temp be too hot.
The 2nd fan is for your Air-Conditioner that should run when the cabin temp is set low enough for the Air-Conditioner compressor to run. This fan should run anytime the Air-Conditoner is switched on.
If your experiencing engine over heat problems when driving slow or sitting idle most likely the fan switch that is switched on by water temperature has failed. The fan switch controls a fan relay and if the relay fails the fan will not run. In this particular model there is a cooling fan module that controls the fan.

Read this link but DO NOT click on any links from that webpage: (They do not work)
http://www.fixautopartz.com/2009/03/20/2003-mitsubishi-outlander-engine-cooling-system

Thanks for choosing FixYa,
Kelly
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Apr 09, 2011 • 2003 Mitsubishi Outlander
0helpful
1answer

My 2000 pontiac grand prix, the Engine temp heats up when at idle, returns to normal temp when at high speed and now it is almost at the overheating level whether i'm ideling or driving, Is it the...
The initial problem points to the radiator fan(s) not running at any road speed. Check the fan(s) for noise-free turning by hand. Check fan fuse and relay (swap with similar relay). Turn on the air conditioner which should immediately turn on the fan(s). Overheating while driving could very well be the thermostat--you will need to drain the cooling system before replacing the unit. Blow out the radiator core with compressed air from the engine side to remove bugs and other debris first. Hope this helps!
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Oct 02, 2010 • 2000 Pontiac Grand Prix
1helpful
3answers

I have 2003 grand cherokee with 140000 miles that overheats at idle. as soon as i start moving again, the temp goes back to normal.
You have two fan's on your truck, 1 is a fan clutch runs with the drive belt, 2 elec fan motor, with test light and engine running at normal temp, just a little bit above 1/2 way on your temp gauge check voltage at elec. cooling fan harness if you have voltage at one of the two wire's and fan don't turn on, bad cooling fan motor, on the fan clutch after you check voltage at elec. fan motor turn engine off, with your hand spin drive belt fan if it spin's freely bad fan clutch, replace it.Also check cooling level.Hope this was very helpful
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Jan 21, 2010 • 2006 Jeep Commander
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Fan for Air Conditioner
You have a fan temp sensor located on the engine block that controls when fan turns on or off.
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