Thermostat / electric fan - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 4 Old 07-19-2015, 02:36 PM Thread Starter
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Thermostat / electric fan

I've got an 07 jk that I run 37s on . I pull a tentrax trailer. Recently it over heated and I found that the fan wasn't working. Could it be the thermostat or a fuse ?
Thanks, Chris
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post #2 of 4 Old 07-19-2015, 07:14 PM
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Won't be the thermostat.

Does it work on low speed and not high speed? If so, this could be the voltage divider or the high-speed relay. The voltage divider is located at the top of the fan shroud on the passenger side. The high speed relay is located behind the driver headlamp.

If it's not working at all, the easiest way to test the fan motor itself is to disconnect the fan motor where it plugs into the voltage divider. Then use a couple pieces of wire to connect the fan motor directly to the battery for just a second. Obviously don't have the engine running for this.
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post #3 of 4 Old 07-19-2015, 09:39 PM
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Quote:
Originally Posted by jedgington View Post
Won't be the thermostat.

Does it work on low speed and not high speed? If so, this could be the voltage divider or the high-speed relay. The voltage divider is located at the top of the fan shroud on the passenger side. The high speed relay is located behind the driver headlamp.

If it's not working at all, the easiest way to test the fan motor itself is to disconnect the fan motor where it plugs into the voltage divider. Then use a couple pieces of wire to connect the fan motor directly to the battery for just a second. Obviously don't have the engine running for this.
Jeff,
You can also check to see if all of the fan components are working properly by popping the hood and starting the Jeep with the AC on. Immediately you will notice the fan start up at a slow wobble, then low speed, then high speed. One other way to check high speed is to unplug the AC pressure switch, causing it to go into high speed immediately.
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post #4 of 4 Old 07-21-2015, 02:00 AM
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I had the problem on the trail a few months back my fan just stopped. We hot wired it so I could get home. After a ton of money at the dealer it was the Coolant fan module resistor.

It is what the fan plugs into and is bolted to the radiator.


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