1999 Jeep Grand Cherokee overheating
08-29-2008, 10:01 PM
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Model: Cherokee
1999 Jeep Grand Cherokee overheating
My 1999 jeep has the 4.0 6cyl with the electric cooling fan. I am currently stumped as to why the electric fan will not turn on. When I jumper 12v to the fan it operates fine. I just replaced the temp switch on the thermostat housing but that was no help as well. I found the fan relay in a compartment next to battery. I swapped the 40 amp radiator fan relay with the 40amp starter relay and this was no help. Is there more to the system that this. I am sure that this circuit goes through the engine computer but I am not getting any troublecodes. Any Ideas.
08-29-2008, 10:39 PM
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My 1999 jeep has the 4.0 6cyl with the electric cooling fan. I am currently stumped as to why the electric fan will not turn on. When I jumper 12v to the fan it operates fine. I just replaced the temp switch on the thermostat housing but that was no help as well. I found the fan relay in a compartment next to battery. I swapped the 40 amp radiator fan relay with the 40amp starter relay and this was no help. Is there more to the system that this. I am sure that this circuit goes through the engine computer but I am not getting any troublecodes. Any Ideas.
08-29-2008, 10:42 PM
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Year: 1995
Model: Cherokee
Engine: 4.0
There are two relays. Mine blew the one under the hood, I got lucky with it.
The other is under the passenger headlight.
Fan relay writeup
Or the Temp sensor needs replaced.
The other is under the passenger headlight.
Fan relay writeup
Or the Temp sensor needs replaced.
Last edited by Mykal; 08-29-2008 at 10:46 PM.
08-29-2008, 11:52 PM
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08-30-2008, 12:00 AM
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Year: 1995
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08-30-2008, 10:24 AM
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Thank you
Thanks everyone for your help. It was that relay. The relay I changed was the "radiator fan relay". Im not really sure what it is for but it obviously was not the problem.
08-30-2008, 11:14 AM
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Year: 1990XJ/1989MJ
Model: Comanche
Engine: 4.0L Renix
Shouldn't this thread be in the GC chat area since most of us don't have grands here?
Moderators wake up and smell the coffee.
Moderators wake up and smell the coffee.
07-31-2011, 11:11 AM
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Originally Posted by okcjeeper
lol are those mods sleeping again geesh they need to earn their pay..
I have been wondering why this was still in here..
I have been wondering why this was still in here..
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