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What will my cooling fan only run when the ac is on?

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I would say the temp sensor for the fans that is screwed into the cyl head is bad and needs to be replaced. get the new sensor for the fans so you know what your looking for on the engine.

Posted on May 18, 2014

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SOURCE: 2007 cobalt cooling fan runsonly when ac is on

probly need to replace the coolant temperature sensor

Posted on Mar 29, 2010

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1 Answer

Cooling fans run at cold start


That may be normal depending upon what you are doing in the vehicle. If you have the climate control system set to defroster, most vehicles run the AC system to avoid fogging. Anytime the AC system is engaged the cooling fans must run. Make sure you don't have the AC or defroster on and try again. If the fans still run it could be a faulty fan switch.

Nov 02, 2013 | 2004 Ford Freestar

1 Answer

My 1994 Toyota Previa LE overheats when I put on AC. It overheats while on idle.


cooling fan not running.check for faulty cooling fan relay or fuse.cooling fan fan should be running when you turn on AC.hotwire cooling fan make sure cooling fan motor okay.

Jul 10, 2013 | Cars & Trucks

1 Answer

Hyundai accent 2002 car high temparature during start ac


check see if cooling fan running could have faulty cooling fan relay or fuse.if cooling fan dont run when ac on car will overheat.AC COMPRESSOR PUT LOAD ON ENGINE.

Sep 06, 2012 | 2001 Hyundai Accent

3 Answers

Ford focus 2006 engine overheating once ac swicth is on..


CHECK TO SEE IF COOLING FAN IS RUNNING.IF NO CHECK COOLING FAN FUSE AND RELAY.THE COOLING FAN NEED TO BE RUNNING WHEN AC ON BECAUSE AIR CONDITIONER PUT A LOAD ON ENGINE.COOLING FAN KEEP RADIATOR AND AC CONDENSOR COOL.FAN NEED TO RUNNING.

Sep 04, 2011 | Ford Focus Cars & Trucks

1 Answer

When I turn on my a/c the car starts to everheat


When ever the car overheats,it is always the best thing on your car,to check the cooling fans.When the ac is on,look to see if the cooling fans are running,and running fast,and smoothly.In your case,I am going to go out on a limb,and say they are not.First check for blown cooling fan fuse.Then,if the fuses are alright,check the cooling fan relays,most likely more than one.One prong,or spade coming out of the relay,is ground(where it plugs up).To make the relay energize,ground this terminal with a test light .Just like you are using the test light to check for 12 volts.When you touch the ground spade on the relay it will energize the relay to turn the fans on.Just pull the relay out of it`s spot,just enough to touch the spade.Do this with the ac on,and engine running.The clutch relay on most cars will energize the relay,but the ac compressor is working on your car,so it is either the fan relay,or the high side switch on the ac system that is bad.Try and see if the cooling fans,both of them,or one of them,will come on by them selves as the car warms up,with the ac off.The fan or fans should come on,and go off by themselves.Don`t let the engine overheat,keep a good eye out not to let that happen.If the fans never come on,then,the fan,or fans could be bad.You can test them by running wire from battery to the fan,and grounding to frame.Now the fuse,or relay being bad will also cause this.If a fuse is blown,then ,one or more of the fans are bad,and will have to be replaced.The fans cool the radiator for the engine and transmission cooling,and the condenser for the ac system.If the condenser is not cooled down,the ac freon will be to warm to cool the vehicle.If I can help,let me know.>>roniecon@gmail.com

Aug 26, 2009 | 2000 Honda Civic

1 Answer

Mercedes benz airconditioning


You might check the cooling fans on the condenser to see if they are running when the ac is on.If they are not check for blown fuse,or bad cooling fan relay.Do you notice if the ac cools better when running constantly,and the ac is not so cool when in traffic,stopping and going,and running slow?If so the cooling fan,or fans are not working.If the fan fuse and the relays check out fine,then replace the fan,or fans.If I can help any more please ask.roniecon@gmail.com

Aug 19, 2009 | 2004 Mercedes-Benz C-Class

1 Answer

Kia over heats when air is on only


your AC cooling fan is not working properly, most vehicle has two fans, one for the radiator and another for AC, both work in sync with one another; if one cooling fan only working it does not produce enough cooling for both radiator and condenser at the same time; by running ac you producing more heat and its cant cool the engine fast enough with one fan so your engine is overheating when running AC. The temperature sensor could be faulty and need to be replace or your fan motor can also be faulty. Check the fuse first and the relay make sure they are not burn out. sensor cost about 30 bucks get it new, relay 35-40 new used 5 bucks at junk yard, fan get it from a junk yard for 25-30 bucks, new will run over 100 bucks. don't run the air and overheat your motor, it can damage your engine or may blow your radiator. if you do run ac watch the temp very closely, don't let temperature get into the red.

Jul 10, 2009 | 2002 Kia Sportage

3 Answers

Engine fan doesn't run with or without ac


Check the cooling fan switch/ cooling fan control. as their job is to monitor temp. of engine, and turn the cooling fan on and off.

Dec 30, 2008 | 1997 Chevrolet Monte Carlo

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