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Old 06-27-2013, 04:08 PM   #1
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electric fan on 2.4 tj not working

I have an 04 tj with the stock elec fan. It has ran hot on me three times during the past two weeks. All three times were at 130 pm in the fl mid day heat of stop and go traffic.
I replaced the thermostat after the first incident. After the second time I began suspecting the fan controller but was unable to find a thermol switch. While I was looking for it yesterday I tested the operation of thw fan and it seemd to work perfect except for not constantly running while the ac was on however was cycling on and off and the fan seemed to engage in slow while the compressor was engaged.
It ran hot again today and I pulled to the side and opened the hood while at 250 degrees . The fan was not on.
I do have a cheap haynes or chiltons from auto store but it is very vague on the ele fan and provides no troubleshooting guide.
So I turn here for help. Im no stranger to tools . Ive turned wrenches on aircraft and my own vehicles for 20 years.
Ive had other vehicles with similar problems in the past and found cooling problems to be thermostat' thermo switch or the fan or controller. With not having any experience with the tj electrics I was hoping someone could offer some advice as well as perhaps a method of wiring the fan to also run in manual mode.
I have searched the forums and have found many threads for aftermarket kits but none for the stock system. Any help will be appreciated.
As I said before the fan was running perfectly in my yard yesterday which leads me to think switching unit or possibly a fan motor breaking down when hot? Thoughts?

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Old 06-27-2013, 04:29 PM   #2
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You're going to have to hunt down an electrical gremlin.

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Old 06-27-2013, 04:35 PM   #3
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Most likely a sensor is bad not telling it to turn on. Did u try hot wiring it to see if it works at all?
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Old 06-28-2013, 02:50 AM   #4
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Just went through this exact problem with my friends 79' Chevy stepside. It turned out to be the relay for him. It has to be either the relay or the temperature sensor. I was able to figure out if I took the relay out, hit it on the side of the truck, and plugged it back in, it would work fine. A new relay solved the problem.

If I were you, I would just buy a whole new relay and temp sensor. Depending on fan amperage, jegs has some for $40. This would save you the trouble of finding the problem and finding the correct relay/sensor to fit the current system.
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Old 08-23-2013, 11:16 PM   #5
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im having the same issue on the same jeep my fan wont turn on my relay is good my fan is good i changed the sensor near my radiator hose on the front of the motor idk if theres another relay hidden somwhere or a sensor i dont know about but i need help!!!
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