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Thread: Highway Overheating

  1. #11
    Fresh Catch Lmoye22's Avatar
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    Quote Originally Posted by JKDream View Post
    And what gears/tires are you running?
    I'm running 5.13's with 37 General grabbers.


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  2. #12
    Addict jeeeep's Avatar
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    lots of good recommendations, I would start with burping the cooling system.

    have coolant on hand in case you need to add more.

    with the front end raised up (axle on jack stands), heater off, cap off, run it for a few minutes until to temperature. if you see bubbles, you've got air in the system.

    add coolant as needed. once you're satisfied all air is out of the system, turn on the heater to make sure no air is trapped in the heating core.

    I've had to let mine sit overnight raised with the cap on loosely to get all the air out of the system.

  3. #13
    Fresh Catch Lmoye22's Avatar
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    Quote Originally Posted by fiend View Post
    Did you change your tune with the Superchips? If so try returning to stock (other than changes for gearing and tire size).

    Also, I have read unfavorable things about Mishimoto radiators. If you have or can get a stock radiator, try that.
    I haven't tried that yet! I have noticed the jeep shuddering at idle. I'll give it a shot! The dealer can't find anything wrong either and two other shops. I have read a lot on this and seems like jeeps run hot but all this started about a year ago.


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  4. #14
    Fresh Catch Lmoye22's Avatar
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    Quote Originally Posted by aTX427 View Post
    There are a lot of good suggestions. Definitely check for air in the cooling system and remove the tune. How many miles does the engine have and what oil are you running?

    Check your oil - is it low, does it look or smell burnt? Low oil levels, pre-ignition and spun bearings will cause excessive heat.

    High air temperature and mountainous driving will certainly raise temperatures, but 245* isn't unheard of.

    My vette would see 300* regularly in the Texas heat. I just ran very good oil that could handle it without breaking down. If everything checks out, try a Joe Gibbs turbo car oil or Mobil 1 v-twin. Both have exceptionally high temperature ratings.


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    Engine is at about 142k but I do have a pretty bad oil leak! I want to say it's my rear main seal. Once I get it fixed I'll try the better grade oil.


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  5. #15
    Fresh Catch Lmoye22's Avatar
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    Quote Originally Posted by cozdude View Post
    Almost sounds like there is still air in the system. I would suggest trying to burp it again.
    Is there a proper way to burp the JKU?


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  6. #16
    Fresh Catch Lmoye22's Avatar
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    Quote Originally Posted by fiend View Post
    Did you change your tune with the Superchips? If so try returning to stock (other than changes for gearing and tire size).

    Also, I have read unfavorable things about Mishimoto radiators. If you have or can get a stock radiator, try that.
    I do still have the stock. Was thinking of going back since the new one didn't really change much. I read a lot about the leaks on these Mishimoto's , any other issues? So far so good on the one I have but really thinking of switching back and returning if possible


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  7. #17
    Guy with a Red 2-Door cozdude's Avatar
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    Quote Originally Posted by Lmoye22 View Post
    Is there a proper way to burp the JKU?


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    Remove the radiator cap when Jeep is cold, turn Jeep on, turn temp dial to full heat, flan speed can be low, watch coolant level in radiator and watch air come out. Try to keep rad completely full during the process
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  8. #18
    Nothing but a Thing
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    Quote Originally Posted by Lmoye22 View Post
    I'm running 5.13's with 37 General grabbers.


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    Are you getting the hot oil light as well? Mine has overheated a couple of times, mostly due to mud in the radiator. You have a new rad so I don't suspect that is the issue. I'd agree with others and say it's likely air in the system. Run it with the rad cap off and see if any bubbles come up.

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  9. #19
    Addict BaddestCross's Avatar
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    Quote Originally Posted by Lmoye22 View Post
    Is there a proper way to burp the JKU?


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  10. #20
    Fresh Catch Lmoye22's Avatar
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    Quote Originally Posted by JKDream View Post
    Are you getting the hot oil light as well? Mine has overheated a couple of times, mostly due to mud in the radiator. You have a new rad so I don't suspect that is the issue. I'd agree with others and say it's likely air in the system. Run it with the rad cap off and see if any bubbles come up.

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    Once i installed the transmission cooler the hot oil light did go away under hard driving


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