slight over heating - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 09-01-2010, 10:12 PM
Thread Starter
Join Date: Aug 2010
Location: California
Posts: 3
tjemas is on a distinguished road
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.

tjemas is offline   Quote
Old 09-01-2010, 11:21 PM   #2
Rawkon's Avatar
Join Date: Apr 2005
Location: fullerton/big bear
Posts: 2,061
Rawkon is on a distinguished road
Send a message via AIM to Rawkon Send a message via MSN to Rawkon
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?

Rawkon is offline   Quote
Old 09-01-2010, 11:37 PM
Thread Starter
Join Date: Aug 2010
Location: California
Posts: 3
tjemas is on a distinguished road
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.
tjemas is offline   Quote
Old 09-02-2010, 02:48 AM   #4
Nthe8s's Avatar
Join Date: Aug 2010
Location: Oklahoma
Posts: 119
Nthe8s is on a distinguished road
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.
Nthe8s is offline   Quote
Old 09-02-2010, 04:02 AM   #5

WF Supporting Member
Fweaky's Avatar
Join Date: Aug 2009
Location: Central Virginia
Posts: 2,229
Fweaky is on a distinguished road
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.
Nothing is foolproof to a sufficiently talented fool.
Fweaky is offline   Quote
Old 09-02-2010, 05:52 AM   #6

::WF Administrator::
4Jeepn's Avatar
Join Date: Apr 2005
Location: Florence, KY
Posts: 11,454
4Jeepn is on a distinguished road
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.
4Jeepn is offline   Quote
Old 09-02-2010, 07:18 AM   #7
meyers's Avatar
Join Date: Apr 2009
Location: Dover, New Hampshire
Posts: 738
meyers is on a distinguished road
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
meyers is offline   Quote
Old 09-02-2010, 09:10 AM   #8
Abe Froman

5-Year WF Supporting Member
doclouie's Avatar
Join Date: Feb 2010
Location: Was in the mountains, now in Texas
Posts: 3,774
doclouie is on a distinguished road
What model flex a lite did you install in your Jeep? How many CFMs does it pull?
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up, Savvy gas tank skid.

doclouie is offline   Quote
Old 09-02-2010, 11:44 PM   #9
Join Date: Sep 2010
Posts: 1
Axiom101 is on a distinguished road
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

Axiom101 is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
over heating 2.5L str8cr8 YJ Tech Forum 9 01-24-2011 09:14 PM
Oil Furnace - Hot Water Heating - Aquastat Settings TJeepman Off-Topic 1 10-07-2010 06:27 PM
Home heating oil tanks joemd60 Off-Topic 2 02-02-2010 12:29 PM
heating problem etc teamkaliburmma TJ Tech Forum 10 11-22-2009 02:18 PM
Slight gas smell George T. General Jeep Discussion 3 08-13-2007 06:57 AM

All times are GMT -5. The time now is 02:29 AM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC
« Back

Enter your email address:

Delivered by FeedBurner