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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Check your coolant level first. If you are low on coolant, you will see your temperature flucuate. If this is okay, I would then suspect 3 other causes to your problem ( I would troubleshoot them in the listed order). If you are going to replace the thermostat, check the cost of the temperature sensor and if it is resonable I would replace at the same time. This will save you time and money, because you will have to drain the coolant for both jobs. If you have a Ohm meter, you can verify the coolant sensor operation (should be able to get the technical spec's on line for the sensor).

1. thermostat
2. temperature sensor needs to be replaced
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I replaced the thermostat in my 1998 subaru forester. How do I know if it is openning when it needs to? How can I test the pressure in the radiator? What should the pressure be in the radiator?Thank...

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1. Make sure your heater is off.
2. Start your engine and allow it to run for 6 to 8 minutes so it can reach the normal operating temperature.
3. Turn your heat tmperature select all the way up, and then turn the fan on high. You should hear the thermostat click when it opens up to circulate the coolant through the system. You may also notice your temperature gauge reading lowering.

The only pressure you may have in the radiator/cooling system is very minimal and caused by the coolant heating up.Whenever pressure starts building , it is purposefully relieved through your coolant reserviors overflow hose. Thats why you should never fill your coolant reservior all the way up. It needs to have 3 or 4 inches to allaw for expansion.

I hope this helps you.

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Temp gage rises to hot and then drop immediately back to normal. Plenty of water in system. What could be causing problem.

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