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Thread: 99 TJ overheats only on freeway with AC on

  1. #1
    Join Date
    Jun 2006
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    Penis, AZ
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    8,019

    Default 99 TJ overheats only on freeway with AC on

    My jeep only overheats when on the freeway with the AC on. I can run all day at 70mph with no AC and it doesn't complain at all. Once the AC is on, temps start to climb. I can drive around town normal stop/go traffic with the AC on and there are no issues.

    Theory is something's up with the condenser and pushing extra heat onto the radiator maybe?

    Its a 99 TJ 4.0 automatic

    Heres what Ive replaced:
    radiator
    thermostat
    water pump
    hoses
    radiator cap

    Any ideas?
    Zombie Caving
    Siblings are like sausages. Itís better not to see them being made.

  2. #2
    Join Date
    Aug 2009
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    Murica
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    4,891

    Default

    Take your hood off.


    #becauseroadkill

  3. #3
    Join Date
    Jun 2006
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    Penis, AZ
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    Default

    im gonna see about adding a spacer between condenser and radiator and maybe move the condenser down a bit - was looking at alans and its just sitting in there at a funky angle - prolly missing a bolt - but it shows more of the radiator for airflow
    Zombie Caving
    Siblings are like sausages. Itís better not to see them being made.

  4. #4
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    Aug 2009
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    Murica
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    Default

    Quote Originally Posted by offroadaz View Post
    im gonna see about adding a spacer between condenser and radiator and maybe move the condenser down a bit - was looking at alans and its just sitting in there at a funky angle - prolly missing a bolt - but it shows more of the radiator for airflow
    That should make absolutely no difference whatsoever.

  5. #5
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    Jun 2006
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    Quote Originally Posted by Avis View Post
    That should make absolutely no difference whatsoever.
    should* lol

    just guessing around right now and its a zero dollar try

    ill see how it goes - also checking flan clutch - some people say that if its bad - at freeway speeds it wont spin freely like designed
    Zombie Caving
    Siblings are like sausages. Itís better not to see them being made.

  6. #6
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    Murica
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    Quote Originally Posted by offroadaz View Post
    should* lol

    just guessing around right now and its a zero dollar try

    ill see how it goes - also checking flan clutch - some people say that if its bad - at freeway speeds it wont spin freely like designed
    That is true. If I were you, I'd do away with the fan clutch and get set up with dual electric fans. It'll save some load on your motor and work better

  7. #7
    Join Date
    Jun 2006
    Location
    Penis, AZ
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    Default

    Quote Originally Posted by Avis View Post
    That is true. If I were you, I'd do away with the fan clutch and get set up with dual electric fans. It'll save some load on your motor and work better
    yah i ran electric ones on the old TJ -only thing I didnt care for was the noise - but i mighta just had a loud one
    Zombie Caving
    Siblings are like sausages. Itís better not to see them being made.

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