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Thursday, October 13, 2011

Cooling fan will not engage on Jeep Grand Cherokee?

PLEASE HELP.
I HAVE JEEP GRAND CHEROKEE.ITS 2000 YEAR MODEL.
THE ENGINE COOLING FAN IS NOT GETTING ENGAGED WHEN HOT.
IS THIS FAN PROBLEM OR ANY OTHER PROBLEM?
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OK.



The cooling fan wiring needs to be tested first.
On jeep Cherokee,the fan has two wires.
Dark green and Black/Pink wire .
The dark green is power wire,its 12 vol
The black/pink is ground wire.

Check the ground wire first.It should be properly connected and not corroded at the right hand headlamp area. The 12 volt dark green supply wire comes from a fan relay.
The relay is located behind the bumper in the right hand headlamp area.

To test or remove the relay the bumper has to be removed. With your key on, there should be power going to the grey wire in the fan relay and when you reach the hot temperature, that dark green wire from the fan relay kicks in.And should give 12 volts. Otherwise, you need to replace the fan relay.If the wires are loose or not connected then external wire needs to be checked.Also check the ground wire if its not getting ground connection, it will not let the fan to start run,when required.Try connecting another ground wire to fan externally and see if that helps.
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This troubleshooting possibilities will help.THANK YOU.
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For more car related problem troubleshooting:---

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http://schematicsdiagram.blogspot.com/2011/06/how-to-test-starter-solenoid.html

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