Question about 1999 Chevrolet Cavalier

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The cooling fan will not come on what can cause this

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  • yadayada
    yadayada May 11, 2010

    Possible defective fan sensor on the engine, defective fan relay, defective fan motor, blown or leaking head gasket(s).

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  • Chevrolet Master
  • 6,826 Answers

Cooling fan relay or a fuse or fan is badcoolant sensor

Posted on Jul 01, 2009

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Posted on Jan 02, 2017

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check cooling fans fuse and relay.bad engine coolant temperature sensor will cause coolant fans not to turn on.if AC system not working with no refrigerant in the system cooling fans wont turn on when you turn on the AC.problem in PCM will cause fans not to turn on.

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At the main fuse and relay box, check the 30A EGI INJ fuse. If OK, the main relay closes to apply power to the cooling fan relay. Next, check the 30A FAN 1 and FAN 2 fuses.If OK, power is being applied to the fan control module. The PCM processes engine coolant temperature sensor input and sends a signal to the fan control module which, in turn, causes the cooling fan motor to operate. Fan failure could be caused by malfunction of the cooling fan relay, the fan control module, the engine coolant temperature sensor, the cooling fan motor itself, or the PCM

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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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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.

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