Question about 2000 Jeep Grand Cherokee

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Over heating quickly

The other day my wife took a trip out of town and the jeep overheated. She stopped and let it cool down, then came straight home. I changed the thermostat twice and cap but that didnt fix the problem. I start the engine and the temperature gauge says its over heating in a matter of minutes. The water in the radiator goes up then down up then down. I fill then it comes back out. I check the inlet hose and it has alot of pressure on it but the thermostat seems to never open. I am wandering if this may be my water pump. also the heat was working but now is not. I figured the water pump wasnt pumping the antifreeze that far back. any suggestions or answers would help. 99 jeep grand cherokee

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  • bennzoid28 Feb 16, 2009

    I got word from another friend of mine that this maybe air as well. I tried filling it with the heat on but nothing changes. So I tried his way fill radiator to the brim and fill overflow to the brim, then run it down the road. I did and when i got back it was hot, but not flowing out of the over flow. I let it cool then went back out and the overflow was empty. I did the exact same thing again with the exact same results. Can this vehicle have that much air in it. And still no heat.



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First, start engine and attempt to re-fill with the heater on hot. Sometimes they can get airbound. There is little chance this is being caused by the water pump. Far better chance that the radiator is internally plugged. Jeep radiators are notoriously small for the application and have little room for "error" Partial flow will cause this problem... I've seen it as the major reason aside from a head gasket failure for overheating (assuming you put the stat in correctly) I use a swimming pool pumpfilled with household "lime away" rust & lime remover (which is usually what obstructs core tubes). to backflush these, but you may wish to have a shop do it in a more "normal" way.To do this correctly, the radiator must be removed or rust will remain in tank.

Posted on Feb 16, 2009

  • Richard Scordino Feb 16, 2009

    Yes it can! Another trick I use is to park uphill with radiator higher than back end. Or jack up the corner on the same side as the fill cap. Just about when you get to operating temp, turn engine off, wait one minute and fill radiator. re start and shut down just about when therm opens again. It usually will take the better part of a gallon to reach full. Or, keep doing what your friend said, it's fairly valid. Just watch for other signs of other problems... it's rare that a therm goes away by itself unless really old.



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