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Fans not coming on for ac or engine cooling what might be wrong the fuse good

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There should be a cooling fan relay, usually 1 for the engine and 1 for AC (might be labeled as secondary, or accessory.) I would check that next. A working relay will CLICK when activated. The fans are normally told to turn on by the PCM, which receives a signal from the coolant temperature sensor (CTS). It's possible the CTS is not sending the proper signal to the PCM, but I would first check the relays.

Posted on Jul 15, 2010

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The engine Temp gauge got real close to "H"but went down soon as i got rolling.Also engine cooling fans not coming on. even when i engaged AC. the fans are electric. . .?


The reason that you drive and engine cools down is that cool wind is blowing in the grille in front of the car and when you stop, that natural wind stops cooling it down.
First check the fan fuse. If it is OK check the fan itself: just apply wires on the connector of the fan and attache it to the battery (dont mix "+" and "-") If fan will not start, replace the fan motor. If it starts check for the Fan Motor Relay
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Oct 27, 2015 | 2008 Ford Escape

1 Answer

Engine cooling fans only work with AC on


there are two fans, one comes on with the air con, the other when operation temp is reached . check fan fuse and censer if ok check fan motor.

Sep 20, 2014 | 2001 Ford Escape

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2002 dodge stratus overheating when ac is on. what else can i do to fix it?


Is your ac fan coming on when you turn on the ac? If it only getting hot when you turn ac on I'd say your ac fan isnt coming on so check your ac relay and ac fuses. Is your ac blowing cold

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2 Answers

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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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

Engine cooling fans not working all fuses and relays good, fans are also good works when ac runs need location for splice S105


Hello: The cooling fans will not come on all the time with the A/C OFF. The fans will come on until a predetermined temperature (Cadillac the temp is 236) so to check it without diagnostic equipment just let it run and watch the temp gage and see if the fans come on.

Jul 24, 2011 | Chevrolet Venture Cars & Trucks

1 Answer

1996 Honda Odyessey engine cooling fans don't come on and engine on and engine temperature tends to go up. it will only come on when the AC is switched on. i do not need to run the AC all the time but i...


Check all fuses first. if the fuses are okay, disconnect the engine cooling fan connector and using jumper wires, connect the fan motor directly to the battery and ground. If the fan still doesn't work, replace it. If the fan does work, its relay may be faulty. Check in the engine compartment fuse box for the cooling fan relays. Try switching the cooling fan relays and see if the engine fan comes on and the a/c condensor fan stops working. If so, the engine cooling fan relay is faulty. If the engine fan still doesn't come on with a good relay, then check the engine temperature switch located at the passenger end of the front cylinder head. It is supposed to switch (have continuity) when the engine temperature reaches 205 deg F. You can remove the switch and put it in a pot of close to boiling water (212 deg F). If it doesn't have continuity at that temperature, it is defective.

Mar 21, 2011 | 1996 Honda Odyssey

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

2 Answers

95 grand am radiator fan only runs with AC on


Cooling Fan Temp Sensor is the First thing You Check (with what you have described) Cooling Fan Should ALways come On When The A/C is turned On as A/C Adds A Load to Engine, If Temp Sensor is Faulty it Will Not Give GROUND Signal to ECM >For COOLING FAN >RELAY to Give ground and turn ON The Fan.
There ARE 2 temp Sensors that Serve Different Purposes 1 is for Dash READING GAGE & Or TEMP LIGHT the Other is For ECM or Fan Relay (SAME Thing) you Said>""can disconnect the sensor and fan continues to run" < This Leads me to think you Changed the Wrong One. Not Questioning your Skills Just Here to Help.
TEMP SENSOR FOR 3.1L V6 is Located upper RH rear of engine compartment, near exhaust system. Temp SENSOR for 2.3L Engine is Located in LH rear of engine compartment.
I Hope this Helps Lead you to a NON-OVERHEATING Pontiac.
Good Luck and Have A Great Evening. rejakwilson

Feb 04, 2009 | 1995 Pontiac Grand Am

1 Answer

1999 Galant-4 cylinder- automatic. The check engine light came on and the cooling fan stopped. The fan will not come on when the engine is hot, but when you turn the AC to position 1, the fan comes on...


hello check engine light came on first things first check fuse for cooling fan second see if the fan relay checks out okay if so the culpret most likely your temp sensor is out of range the reason for the fan with ac this has a seperate fan relay good luck

Sep 13, 2008 | Mitsubishi Galant Cars & Trucks

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