Question about 1998 Jeep Grand Cherokee

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Engine Temperature Guage on Dashboard indicates overheating

A few months ago, I replaced the radiator, radiator cap, lower & upper radiator hoses, fan clutch, water pump & gasket, thermostat & gasket, serpentine belt and this last weekend the coolant temperature sensor. The engine temperature gauge on the dash runs hot (betwen 210-260). Sometimes when idling, the needle will dart into the redzone (260) and then immediately retreat back to between 210-260. The Jeep is not leaking coolant. I'm puzzled what the problem could be. Please help.

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Hi and welcome to FixYa,

Offhand, your described condition indicates a sticking thermostat, that is there is considerable delay before the thermostat opens. It is also possible that there is some restriction wherein the thermostat is not opening completely when the triggering temperature has been reached. As a test and to confirm, you could try temporarily removing the thermostat and operate the engine without one; observe temperature. The side effect of this test is that it would take some time to warm-up the engine, but operationally should not cause anything untoward. Of course, care has to be exercised that the gasket would still be intact.

Good luck and thank you for using FixYa.

Posted on Feb 11, 2009

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3. Rough, uneven engine idle.
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4 Remove the upper radiator hose.

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11 Fill the radiator and radiator reservoir with a 50/50 mix of coolant and distilled water.

12 Install the radiator pressure tester and check for additional leaks.

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14 Monitor the engine temperature.
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15 Road test the vehicle, maintaining supervision over the temperature gauge.

16 Verify repair by inspecting for leaks or overheating.


Good luck; remember comment and rated this help.

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