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Possible overheating/gauge problem?

 
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Old 02 Jun 2011, 11:03 pm
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Default Possible overheating/gauge problem?

Our 2004 PT has been great over the 80k kms we've put on it, but today my wife was driving it to work and the temp gauge topped out and the temp light came on. She of course pulled over, caught another ride to work and left it for me to look at on my way home. The car had been sitting for aprox 6 hours but when I got in and turned on the ignition the temp gauge showed 3/4 of the way to hot. The car took a couple of tries to start and within a few seconds running showed fully hot on the gauge. The motor was not warm to the touch, neither was the radiator or any coolant hoses. I immediately drove it the few blocks to home, bought and installed a new thermostat just in case, but it shows the same symptoms. The rad fan even comes on right away but still the engine, hoses, water in the rad cap are all barely warm after running a few minutes. Can there be a sensor or something at fault here? Can there be an airlock in the motor preventing the flow of water? I don't want to tow it to the dealer to be ripped off, nor do I want to drive it any distance in case I really damage something. Anyone have a similar experience or suggestion I could check to troubleshoot the problem?

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Old 03 Jun 2011, 06:11 am
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Default Re: Possible overheating/gauge problem?

On the U.S. cars, there's a gauge check that runs through all the dials on each gauge and the numbers where the odometer is.

Hold the button IN where you would reset the odometer as you turn on the ignition key. Don't start the engine, just turn the key forward. That should check all the gauges and you can watch each one as it goes through the motions of going from bottom to top.
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Old 03 Jun 2011, 07:38 am
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Default Re: Possible overheating/gauge problem?

this sounds like your temp sensor to me. I had a 92 bravada that had that problem, the gauge always said the engine was overheating but whenever i put a thermometer on the engine it was never hot. Once I changed the sensor the truck stopped acting up. So I would check that sensor first, try replacing that first. Its only 14 dollars or so, so its not a big bite out of your wallet. And the sensor is gonna be right on the engine block itself, usually near the thermostat.
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Old 03 Jun 2011, 07:46 am
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Default Re: Possible overheating/gauge problem?

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