Jeep overheating





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  1. #1
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    Default Jeep overheating

    Yesterday on my way home from Harties my Jeep's temperature went into the red.

    A guy with a Jeep stopped next to me to help. According to him (he has 2 diesel Jeep Wranglers, one for him, one for his wife) overheating is a general problem on the 2.8 CRD. He showed me my Jeep has 3rd aftermarket 'radiator/intercooler' which according to him is too small for the Jeep. His jeep got a 3rd radiator/intercooler almost double the size of mine.

    Can anyone give me more info on this? Who else experienced overheating the last couple of days with the heat (yesterday it was 41˚C in Pretoria).
    Before you criticize someone, you should walk a mile in their shoes.

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  2. #2
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    I assume you have a JK CRD?

    Does your air con work, on the early JK petrol, the cooling fan wont kick in if the air con is not filled..

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    +1 on this ^^

    The WJ's electric fan also only works with the AC on.

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    Don't know what year model you have.

    the pre 2011 all had the tow package - big oil cooler and intercooler, 3500kg tow rating. 2011 and 2012 didn't have it, 1000kg tow rating.

    don't know what happened after that in terms of packages.

    check the viscous is working properly, and that the electric fan kicks in with the aircon.

    after that , in hot temperatures it will have less power , higher intake temps, so more throttle, higher EGTs.

    if you hold the pedal down the temp will rise. the management should cut it out before you damage the motor, but letting it over run should cause it to cool down readily.

    if the temp remains high while you are off throttle , or keeps rising you have other problems - blocked rad, sticky thermostat or something.

  5. #5
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    I've got a 2010 Wrangler.

    After I let it stand next to the road to cool off, I started the vehicle, drove off and now the temp needle is constantly on the half mark.

    My aircon is working fine.
    Last edited by JCMostert; 2015/12/07 at 03:53 PM.
    Before you criticize someone, you should walk a mile in their shoes.

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  6. #6
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    Quote Originally Posted by JCMostert View Post
    I've got a 2010 Wrangler.

    After I let it stand next to the road to cool off, I started the vehicle, drove off and now the temp needle is constantly on the half mark.

    My aircon is working fine.
    If a motor shows hot, you should rather let it idle or over run as the temp goes down - keeps the water circulating in the block. When it's off the heat soak gets it even hotter.

    were you holding the throttle down for a long period?
    Last edited by Apocalypse; 2015/12/07 at 03:54 PM.

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    Quote Originally Posted by Apocalypse View Post
    If a motor shows hot, you should rather let it idle or over run as the temp goes down - keeps the water circulating in the block. When it's off the heat soak gets it even hotter.

    were you holding the throttle down for a long period?
    I was driving with cruise control.
    Before you criticize someone, you should walk a mile in their shoes.

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  8. #8
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    Quote Originally Posted by JCMostert View Post
    I was driving with cruise control.
    that could do it. it could just hold the throttle open and push up the EGTs / cooling system isn't coping in the heat and up goes the gauge.

    mine used to ease back on the fuel at 3/4 on the gauge if you held the pedal down - lost performance.

    lift off for 30 seconds or so and it would be back on half.

  9. #9
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    Quote Originally Posted by Apocalypse View Post
    that could do it. it could just hold the throttle open and push up the EGTs / cooling system isn't coping in the heat and up goes the gauge.

    mine used to ease back on the fuel at 3/4 on the gauge if you held the pedal down - lost performance.

    lift off for 30 seconds or so and it would be back on half.
    I will just keep an eye on it, I'll drive some open road over the weekend to test it, my thermostat went way up to H, it don't seems like the engine got damaged, no smoke or water in the oil.
    Before you criticize someone, you should walk a mile in their shoes.

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    Quote Originally Posted by JCMostert View Post
    I was driving with cruise control.
    Up Saartjiesnek? In that heat? Silly boy.
    2012 Jeep Sahara Unlimited 3.6 V6
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    Quote Originally Posted by jelo View Post
    Up Saartjiesnek? In that heat? Silly boy.
    Hey! It is my first automatic with cruise control!

    The overheating happened on a straight peace of road, just after the first toll gate.
    Before you criticize someone, you should walk a mile in their shoes.

    That way, when you criticize them, you're a mile away and you have their shoes.

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    Quote Originally Posted by JCMostert View Post
    Hey! It is my first automatic with cruise control!

    The overheating happened on a straight peace of road, just after the first toll gate.
    I would avoid that in high ambient temps then. Revs are too low, EGT too high, water pump and fan not moving fast enough.
    2012 Jeep Sahara Unlimited 3.6 V6
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  13. #13
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    Default Re: Jeep overheating

    So after 4 years my Wrangler overheated again, but this time with a bad effect

    Again without warning the Jeep just started to overheat, the heat gauge climb from half to full within a matter of seconds, pulled over, but this time I noticed that the fan was running at about 2 cycles per second.

    Is the fan controlled by the computer? Because after switching the vehicle off and start again, the fan was running normally as it should've.


    How much on the Jeep is controlled by the computer?

    I did notice that sometimes the headlights don't switch off after locking the vehicle, then I must open and close the Jeep again to get the lights to go off. The same the other day, the Jeep didn't want to go into gear, after switching it off and back on again, the gearbox was fine.

    Click image for larger version. 

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    Before you criticize someone, you should walk a mile in their shoes.

    That way, when you criticize them, you're a mile away and you have their shoes.

  14. #14
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    Default Re: Jeep overheating

    Is that oil in the water?
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    Default Re: Jeep overheating

    Quote Originally Posted by Jeepanator View Post
    Is that oil in the water?
    I'm afraid it does look like it.
    My Chevy is blessed with the same VMMOTORI 2.8 engine and it breaks my heart to see something like this.
    Strongs to the OP.
    The earlier part of this thread never concluded why the initial over heating happened. I really hope it isn't somthing that wasn't addressed and now returned with a vengeance.

  16. #16
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    Default Re: Jeep overheating

    Quote Originally Posted by Jeepanator View Post
    Is that oil in the water?
    It sure is. Had a flatbed taking my Wrangler to Koops yesterday. They must strip down everything and see what went wrong and what the damage is.

    According to Koops chances are 1 out of 20 that the head gasket might have blown (but then there should be traces of water in the oil as well), chances are higher that it is the intercooler that blown. (when the engine overheat the pressure becomes to much for the intercooler and the intercooler crack or burst). The Jeep use the same water circulation system to cool the engine, intercooler and transmission.

    The overheating probable happened because the fan stopped working, why it stopped working is the question. After switching the Jeep off and back on, the fan ran again at normal speed, that is why I'm wondering if the onboard computer is managing the fan, because something reset after switching the vehicle off.

    I don't know enough about turbo diesel engines to know if they are bull**** me.
    Last edited by JCMostert; 2019/08/27 at 07:04 AM.
    Before you criticize someone, you should walk a mile in their shoes.

    That way, when you criticize them, you're a mile away and you have their shoes.

  17. #17
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    Default Re: Jeep overheating

    This is what I can find:

    Click image for larger version. 

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    Are they not refering to the oil cooler?
    Before you criticize someone, you should walk a mile in their shoes.

    That way, when you criticize them, you're a mile away and you have their shoes.

  18. #18
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    Default Re: Jeep overheating

    Don't panic yet - I had the same earlier this year - turned out to be the oil cooler (2013 CRD). Agents fixed it, but a 3 week wait for the part.

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  20. #19
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    Default Re: Jeep overheating

    Quote Originally Posted by Ali-B View Post
    Don't panic yet - I had the same earlier this year - turned out to be the oil cooler (2013 CRD). Agents fixed it, but a 3 week wait for the part.
    What did you end up paying?
    Before you criticize someone, you should walk a mile in their shoes.

    That way, when you criticize them, you're a mile away and you have their shoes.

  21. #20
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    Default Re: Jeep overheating

    25 000 (serious!) - replaced the oil cooler and included radiator flushing. I'm sure you can find an indy who'll do it for a lot less.

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