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Thread: Tell Tale Overheating Signs?

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    Administrator korisu56's Avatar
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    Default Tell Tale Overheating Signs?

    Only gauges that work all the time in the CJ are Volt and Speedo. Are there tell tale signs of overheating? When the temp gauge dies, it falls down which makes it look like its overheating. She runs fine, no change in anything that I can feel.

    CJ has:

    4.2L, stock carb

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    covered in mud tickwomp's Avatar
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    If your feet are hot it's too hot. I had a car that overheated a lot and my feet would sweat since the engine is right there. I had to turn on the heater to pull heat off the engine.
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    if you have low oil pressure that can be a sign of over heating too. typically smoke from under the hood would indicate over heating, the engine seizing up violently would be a sign of over heating, when it shuts down on its own thats a possible sign of over heating as well...

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    Senior Member HillBillE's Avatar
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    Get a machanical temp guage.

    I'll grab some pics on how to install on the 4.2. (stock sender hole is to small)

    It's better to know where it's running, becuase once they get hot, they go fast, cuasing serious engine damage.


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    the smell of antifreeze coming into the cab
    Rocks to a Jeep are like crack to an addict

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    Administrator korisu56's Avatar
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    Thanks everyone. Looking forward to the pics randy. I guess now its time to wonder Wtf its overheating

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    Administrator/Jarhead Jeeper USMCHarleyJeepGuy's Avatar
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    Big plume of smoke with no flames coming from under the hood that smells like antifreeze is a pretty good indicator!
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    Senior Member HillBillE's Avatar
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    Quote Originally Posted by korisu56 View Post
    I guess now its time to wonder Wtf its overheating
    Stuck thermostat is usually the culprit, although it could be other things.

    Broken/loose fan belt

    plugged radiator/block (especially if BARS Leak was ever used)

    Low coolant

    bad cap, pinhole leak in one of the hoses, where pressure won't build

    Grab pics today.


    As long as the people remain armed,
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    do so out of duty, honor, oath and love of country.


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    Administrator korisu56's Avatar
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    See, I think the radiator just needs to be changed out. Will likely change the thermo while I'm in there.

    Will the thermostat stick and unstick even during hours of driving? When my TJ's thermo stuck, it stayed like that and never released. This one will overheat and stay until I turn the engine off for a minute and then it will cool down. I did the heater trick and that helped every now and again.

    What other components are involved? Water pump?

    Also, belts are fine, coolant is fine.

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    Senior Member HillBillE's Avatar
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    It's rare that the T-stat will stick/unstick, but it does happen.

    Sounds more like a plugged radiator.

    If the water pump is original/old, night as well replace it while your in there.


    As long as the people remain armed,
    government knows that it cannot rule over the people by force.
    Those who stand in defiance of unconstitutional laws
    do so out of duty, honor, oath and love of country.


    "Certified Jeep Junky!"


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