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Old 09-01-2010, 11:12 PM   #1
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slight over heating

I installed a flex a lite fan on my 04 tj. The temp is about 215 while driving on the freeway. The fan goes on when the temp gets to 190. I have had the radiator flushed, changed the thermostat (195) When I have to pull up a long hill on the freeway and downshift to forth gear the heat goes up quite a bit. Does anyone have any ideas to rememdy this problem.

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Old 09-02-2010, 12:21 AM   #2
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are you running the stock radiator? Ive had similar issues and it may be the fan just doesnt pull enough CFM. when you run the stock fan did it do the same or did it run cool? why did you go to a flex alite?

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Old 09-02-2010, 12:37 AM   #3
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I did not have the problem with the regular fan. With the flex a lite I was looking for better MPG and more power. I am using the original radiator but I am looking to upgrade that. Do you think the thermostat is the correct temp. I was told by three different part stores what temp to use 160, 180,195. I put the 195 in but I bought the 160 also.
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Old 09-02-2010, 03:48 AM   #4
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Put the 160 in, your jeep is still gonna build up heat but this will kick in much sooner it is usually required too if you do any programming or perfomance upgrades.
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Old 09-02-2010, 05:02 AM   #5
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The electric fan saving power and MPG is a myth. The savings will not be noticable to most. I run one in my YJ just because I don't have room for the clutch fan and I see no difference in power or economy. If your fan is coming on at 190 that is about right for the range it should come on. The main thing you need to check with the flex-a-lite is the location of the thermostat. It needs to be located near the coolant return from the motor and about two or three rows down. Make sure your radiator is full and you don't have any air pockets as this will cause problems with the thermostat reading the coolant temp. The temp will be higher on the highway with the electric fan because of the shroud design. It restricts air flow at higher speed. It will normally cool better in stop and go traffic and on the trail. The fans that are open without a shroud cool better on the highway but no as well in stop and go. Believe me I have tried them all. If you are sure you system is clear you may find your better off with the factory fan set up. Make sure you dont have anything blocking the grill or disturbing air flow to the radiator like a tall winch . With and electric fan as this can be a big problem on the highway. I moved my solenoid off my winch and mounted it under the hood and it made a big differance on the highway with my electric fan.
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Old 09-02-2010, 06:52 AM   #6
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I would check the system for air. Then burp it by compressing then releasing the upper hose to get the air out. As for the thermo, I have always had issues on any Jeep, car etc, when I did run the factory temp setting.
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Old 09-02-2010, 08:18 AM   #7
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Best way to make sure you have no air, is to open the radiator when it is cold, make sure it is full. Then with the cap off and the defroster on high heat let in idle in the drive way. It will warm up and as the coolant moves through the block all the air will naturally burp up through to the filler neck. Give it sometime. That should be the first step just a bit of air can cause you problems. If you have the 195 thermostat you should be okay, that is what it is designed to run.

Make sure your probe is installed close to the inlet hose. Another thing that can't hurt is to reset the temperature control. Turn it all the way down when the engine is cold and let the Jeep idle to warm up then when you temp is near normal, turn that knob so the fan kicks on. May be that you have a couple of things combined that aren't quite where they are supposed to be. Good Luck
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Old 09-02-2010, 10:10 AM   #8
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What model flex a lite did you install in your Jeep? How many CFMs does it pull?
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Old 09-03-2010, 12:44 AM   #9
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Originally Posted by doclouie
What model flex a lite did you install in your Jeep? How many CFMs does it pull?
My TJ was always running hot finally I sprung for a Flex a lite fan,a three row aluminum radiator, 180 degree thermo and a 170 degree thermo switch and relay. I plumbed the thermo switch with a brass tee on the thermo housing. The thermo switch activates the fan at engine temp not radiator temp. I live in Florida around town my temp is around 175 the hottest it's reached is 195 with the AC on! Good luck

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