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Cooling fan only comes..what causes? - 323 Mazda Cars & Trucks

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Thermo switch faulty

Posted on Apr 13, 2014

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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.

Sep 27, 2012 | 1996 Buick Century

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2000 durango cooling system fan running non-stop


Many engine control system faults can cause the radiator cooling fan to come on and run non-stop. Also, if your A/C is on or if you have your heating and cooling controls in DEFROST mode, this can cause the radiator cooling fan to come on (normal operation). Or there could be a cooling fan circuit malfunction (like a stuck relay) causing this to happen.

Check to see what mode your climate controls are in. If the climate controls are not in A/C or DEFROST modes, then you should have your engine control system properly diagnosed to determine the cause of the radiator fan being on continuously.

Also, if the Check Engine light is on, this is a clue that the engine control system is malfunctioning.

Nov 24, 2011 | 2000 Dodge Durango

1 Answer

What causes cooling fans to stop working on a 92 cadillac seville,i unhooked the temperature sensor and they still didnt come on can it be the relay


Unhooking the temperature sensor will not cause the fan to come on. Yes it could be the relay. It could be the fan. It could be something else also. Usually the cooling fan won't come on during winter.

Feb 28, 2011 | 1992 Cadillac Seville

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Coolant sensor keeps saying bad would that cause it to over heat jeep laredo 97 grand cherokee


Yes, cause that sensor operates the electric cooling fans by the radiator, if those fans or fan don't come on, the radiator can't cool down as quick and causes the engine to run hotter.

Aug 11, 2010 | 1997 Jeep Grand Cherokee

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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

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