Question about 2001 GMC Jimmy

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Over heating during offroading

Every time i go off road or climb steep logging roads my jimmy after i stop always boils over through theover flow vent hose is this normal,as i have no problems with it other wise

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  • dragonring Jul 01, 2008

    why does my 2001 jimmy 4.3 4 wd only over heat when i climb up steep grades

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I would suggest have the radiator cleaned thoroughly. the radiator may not be operating at full capacity due to some blockage. under slow speeds with high strain on the engine, the fan just isn't cooling it enough. when driving normally with wind blowing thru the radiator it would seem normal, even with some blockage. 

Posted on Jul 01, 2008

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I am assuming you have the 4.3L V6 and it's 4wd. I use to have the same problem with a 96 S10. Typically when climbing hills it harder for the oil get pumped to the top of the motor, which can cause overheating. One little trick you can do is swap out the thermostat with one of a lower temp. Basically the thermostat is what controls coolant into the motor, On your Jimmy it opens at 190degree's, so no coolant flows through the motor until it hit's 190. You can replace the thermostat with one that opens at 160 or 165, this will allow more cooling time for the motor. I also had a 89 Jimmy that had this problem, infact my Jimmy overheated on the highway on hot days, I had put in a lower temp thermostat and problem solved on both these trucks.

Good Luck

Hope this helps

Posted on Jul 01, 2008

  • Patrick McGee
    Patrick McGee Jul 01, 2008

    This was taken word for word out my haynes repair manual on the 4.3L.



    Causes for Coolant Loss:

    1.)too much coolant in system

    2.)Coolant boiling away due to overheating

    3.)External or Internal Coolant leakage

    4.) Faulty radiator cap, have cap pressure tested or replaced.



    After checking and or replacing coolant system parts, the only other cause for the overheating on hills is the head gasket is loosing it's seal. Any white smoke coming out of the exhaust?



    Good Luck again

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