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Ac condenser fan wont come on, car overheats. Is there a sensor or relay that needs to be replaced? And where might these be located?

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Take it to an automechanic who fixes AC units. Your system may need to be recharged. If it is over a certain age, some of teh refrigerant will have leaked and the only way to get it working again is after an overhaul.

Posted on Apr 13, 2015

Testimonial: "well thank you, but the refrigerant has been checked out not too long ago and is strong, so Im suspecting maybe a sensor or relay or switch as im finding out now it happens only in transit when the car is like stuck in traffic and idling so... still looking for some advise please"

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How long for the ac fan to start working? Ive noticed that the fan does not work when i turn the ac on, can this cause my car to overheat. I check the temp and coolant liquid both seems fine.


the ac fan starts as soon as the ac is switched on
the fan is provide cooling of the condenser before the radiator to prevent high head pressures in the ac compressor
it is the fan at the front of the car mand does not affect engine temp
there is a radiator fan between the engine and the radiator that will not start until the coolant temperature reaches a set temp at which point the ECM switches that fan on
if that fan is not working when the engine is hot , check for fan, coolant temperature sensor switch , fan relay, fuses or problem ECM

Jan 13, 2016 | AC Cars & Trucks

1 Answer

Why wont my radiator fans work without the ac on


The fans are thermostatically controlled except when the a/c is on. If the engine overheats, the sensor needs replacing. If it doesn't overheat, the fans do not need to come on all the time

Apr 30, 2014 | 2001 Nissan Sentra

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.

Sep 27, 2012 | 1996 Buick Century

1 Answer

Radiator Fan for 94 centry does not come on. Engine overheats. I assume temp sensor is faulty. I have hot wired the fan to ensure the fan does work, but without those wires... no luck. I hate to just...


the ECM turns on the fan when the coolant sensor reaches a set temp. the fan is also turned on when the AC is on. there is also a fan relay in the circuit. none of these are very expensive. if the fan works when you apply direct voltage, the fan is good. replacing it will not solve your problem. an electronic component locator can show you where the temp sensor and fan relay are. your local auto parts store can look that up for you.

Sep 03, 2010 | 1994 Buick Century

1 Answer

The condenser fan blew out and damaged my radiator on a 2005 civic ex. The car is over heating and as the temperature needle goes up the radiator fan does not move. It only moves if I put the air on and...


hi
1st u have to replace condenser fan and radiator assy , it will solve your problem , cause due to no coolant radiator fan is not working and cause of engine overheating a/c system got trip . replace both condenser fan and radiator and put new coolant. thanks.

Mar 29, 2010 | 2005 Honda Civic

1 Answer

Vw passat 03 overheats when ac is on in peak traffic/stationary


since the water pump was replaced, make sure you don't have an air pocket in the cooling system. flush your cooling system again. remember, if all was well before the tune up/preventative maintanance, it's within those items that were replaced. I don't think it's the condensor, thats a/c related, but the radiator and water pump, well those can cause overheating problems. when the system overheats, you will feel it in the ac.

Sep 23, 2009 | 2002 Volkswagen Passat

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

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

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

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