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Cooling fan not coming on - Cars & Trucks

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  • Steve Foster Jul 30, 2013

    its a 2007 pontiac g5 2.2

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Check your fuse...most likely your your fan motor has went out

Posted on Jul 30, 2013

Testimonial: "checked all fuses and relays no luck "

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Cooling fans Will not come on car overheats well


you can disconnect the electrical plug on the rad cooling fan/s and run jumper wires directly to the motor contacts from the battery if it does not run replace the cooling fan motor. if the motor runs then check for a bad cooling fan relay. this is were its best to have a scan tool as you can see the coolant temp of the engine and the computer commanding the cooling fans to come on. if the computer commands the fans to come on then you have eliminated 2/3 of the system working.

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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.

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1 Answer

Cooling fan control when driving on X-way and then exiting to a stop light the temp does not show high but with steam coming out from under the hood it must be hot. The fan(s) never come on. At what point...


you can disconnect the fan(s) and run 12 volts directly to the fans to see if they are working...you need to check the following parts: there should be a fuse panel located inside the engine compartment...check the cooling fan fuses, the cooling fan relay, and possibly the cooling fan sensor located on the engine

Feb 05, 2011 | 2001 Mitsubishi Galant

1 Answer

Cooling fans will not come on my 1997 olds aorura


This could be a lot of things,check the fuse for the cooling fans,then check the coolant level,and if there is air in the cooling system this will happen,and of course the coolant sensor could be at fault,and the cooling fan relay.

Jun 05, 2010 | 1997 Oldsmobile Aurora

1 Answer

Cooling fan on radiator do not work sending unit on block checks ok with oms meter relay in fuse box ok now what


Change the thermostat and bleed the ir from the cooling system,then ,if the cooling fans do not come on,check the relay module under the cooling fans on drivers side,they are bad to go out,but if there is air in the cooling system,the cooling fans will not come on.

May 31, 2010 | 1998 Dodge Caravan

2 Answers

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Chevy dealer says will not come on until temperature reaches 219 f

May 16, 2010 | 2007 Chevrolet Silverado 1500 2WD

1 Answer

Car runs hot at an idle. turn on the air and the fan comes on and cools off . does the ect control the fan function when the air is off? 1994 camaro 3.4.


The Cooling fan is Wired in in such a way so as to Automaticly Turn on Cooling Fan If the A/C is Switched ON. If "WITHOUT the A/C on" The Cooling Fan Doen NOT come ON Untill Engine. is @ 210-230 Degrees
There IS a Problem with the Engine COOLING SYSTEM, A Faulty Coolant Temp Sensor Will Cause this Problem. The Cooling fan is Also A Candidate For Testing.

Answering your Quwstion YES The Engine Coolant Temperture Sensor Tells the ECM What the TEMP Is and the ECM Grounds the Cooling FAN Relay to Turn ON Cooling FAN. Temp Sensor is the Usual Culpret, BUT Relay Comes in a CLOSE Second. Hope this Helps !!!

Jun 15, 2009 | 1994 Chevrolet Camaro

2 Answers

Cooling fan won't come on, have tested fan and replaced temperature sensor.


First question to you is.. Have you checked the wiring or ECU codes?




check the cooling fan switch on the back of the block, unplug the connector and jumper.
2 wires, turn ignition on and fan should come on...

if it does-----replace the cooling fan switch
if it doesnt----- go to the cooling fan relay on the pass side inner fender
panel behind the headlight and check it, besides the fan itself and the fuse, those are the only things in the system.

May 11, 2009 | 1987 Chevrolet Cavalier 4 Door

1 Answer

Cooling Fan Control


there is a relay in the junction box under the hood if the cooling fan is not coming on when the engine is at 180 degress you can take the a/c clutch relay and switch it with the fan relay. if the fans come on it's the relay if it still doesn't it's the temp sensor on the fan unit....please rate this

Sep 02, 2008 | 1995 Ford Escort

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