Question about 1992 Isuzu Rodeo

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Overheating The temperature guage shows the coolant to be quite hot then it will drop down to normal operating range then back up to hot, down to mid range, back to hot, down to normal. This happens when I am moving. When stopped in traffic or parked the temp gets very hot and stays there. Is this a water punp problem or something else. I recently replaced the radiator and thermostat about 6000 miles ago. Thanks for any ideas.

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It may actually be a coolant temp sensor problem - they do have issues sometimes. I'd replace that before anything else - they're generally inexpensive (in the $20 or less range). If, when you ask for a new one, they ask you which one you want, you need the one for the dash gauge. Some cars have one for the gauge and one for the car's ECU. Your problem is with the one that drives the gauge, so get that one.

Posted on Aug 02, 2008

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If it were a defective water pump, the increase in temperature would not go back down to "mid range (getting cooler)", so most likely it is not.

It is most likely a sticking thermostat as that is basically its purpose, to restrict the coolant flow and allow the engine to reach operating temperature thereafter grant free flow of the coolant. It would seem that there is considerable delay in its opening and therefore the temperature rises above the normal operating temperature.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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