Question about 2002 Jeep Grand Cherokee

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Cooling fan runs continuous - 2002 Jeep Grand Cherokee

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Likely the relay has burned closed (better than open) It usually is below the right headlight and above the vacuum container there. Go in from under car.

Posted on May 08, 2010

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A significant number of cars have an electric cooling fan supplied by a battery live rather than an ignition live because it is believed the cooling fan should be able to start or to continue running after the engine has been switched off.
Coolant will continue to circulate after switch-off due to thermo-syphon activity and it could reduce mechanical stress on engine components to continue cooling.

Some people modify the cooling system by fitting an additional manual switch to over-ride the thermal switch for use when standing in traffic, for whenever continuous operation is desired or to use in emergency should the thermal switch operation fail.

In the absence of such a modification that has been inadvertently switched on the fault will be due to a faulty thermal switch, a faulty or stuck relay or shorted wiring. Disconnecting the thermal switch should stop the fan and if it does it indicates the switch is faulty. The switch is mostly fitted into the radiator header tank but sometimes is fitted to the bottom tank or the thermostat housing.

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1 Answer

Fan relay switch


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1 Answer

Cooling fan runs continuously, even after shutting the ignition off


sounds like it could be a relay.

With everything plugged in and the fans running with the key off remove the cooling fan 1 fuse. Do they stop?

If they do not stop remove the cooling fan 2 fuse. Do they stop?

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1 Answer

I have reno megane 04 my fan continues running when my car is not running i have had the air presureit has just happened again sensor replaced bu


Many cooling systems are designed to let the cooling fan continue to run even after shutting down the engine...however, this should only last for a minute or so...your owners manual may help. If the fan never stops when turned off this is probably a faulty resistor...may need a good mechanic to confirm which...Hope this helps.

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1 Answer

Radiator fan motor does not run


1. check the cooling fan fuses
2. supply battery voltage directly to the fan assembly plug
a. if fan is good
locate and test/replace cooling fan relay
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replace cooling fan assembly
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1 Answer

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The thermostat switch need to be check and change.

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1 Answer

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As long as the fan eventually shuts off this isn't a problem,the fan will continue to run for a bit after the car is turned off,once it reaches a set temprature it will turn off.

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