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Cooling fan and ac fan will not run with out suppling 12 volts

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I have a saturn sl1 The cooling fan an ac fan will not come on What is the pro

Posted on Dec 23, 2008


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Dodge Stratus R/T fan doesn't come on while car is running and car is getting hot.


It can be issue with faulty motor or its faulty fan control relay.

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Nov 27, 2012 | Cars & Trucks

1 Answer

Compressor and fans do not turn on until rev engine

I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.

Jul 24, 2012 | 1992 Buick Regal

1 Answer

Radiator cooling fans will not run

first check that the fuses are present, and not blown. Test all of the fuses. rarely a relay goes bad, but you could swap the radiator fan relay with the ac clutch relay to verify it's ok. Then check for power and ground at the connector for the fan motor with the engine on, at operating temp., and with the ac on. If you have at least 12 volts between the two wires on the connector, then buy the fan.

Feb 02, 2012 | 2002 Ford Taurus

1 Answer

2002 Mazda Milenia. Coolant level ok. In heavy traffic or at idle it runs on the hot side. Also my AC stops cooling

Troubleshoot your radiator fans. Could be the main one failed. The AC booster would have a hard time keeping engine and AC cool for more than a few mins.
Check the under hood electrical box. Fuse, relay. Possible the fan motor itself. Unplug it at the wire connector and jump 12 volts to it. No go, replace fan motor.

If this helps - Please vote.

Jul 27, 2011 | 2002 Mazda Millenia

1 Answer

The cooling fans do not come on I can not find a fuse for this in either fuse box. would it be located somewhere else?

Fan should only come on when coolant temp exceeds 218F or when ac compressor is running. Turn fans by hand with key off. If they feel rough or sticking they are bad. With the engine running and AC on you can take a 12 volt test lamp and check for power supply at the fan connector.

Nov 19, 2009 | 1999 Dodge Caravan

2 Answers

1995 chrysler concorde electric cooling fan does not work.

check the relay, if that is good check for 12 volts at the fan with ac on. if you have a 12 V at the fan then replace fan assy.

Sep 16, 2009 | 1995 Chrysler Concorde

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.>>

Aug 26, 2009 | 2000 Honda Civic

1 Answer

Cooling fan does not operate on my 1991 oldsmobile, cutlass calai

Your cooling fan is controlled by a temp switch and ac on/off. If it doesn't ever come on check fuse, check relay and check temp sensor. run diagnosticscould help..check fan motor with 12 volt power

Dec 15, 2008 | 1991 Oldsmobile Cutlass Calais

1 Answer

Cooling fan not working properly

Look at the fan radiator switch
Try unplug the CTS,if you see the radiator working continuously
Than the CTS, than change it

Jul 08, 2017 | 2005 Mitsubishi Endeavor

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