Temperature hand rises while driving and back normal when car is parked

1996 MERCURY MARQUIS
165,000 MILES • 4.2L • AUTOMATIC
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Never smokes under the hood as if it is running hot though. I have changed thermostat twice, temperature sensors also. The sensor on the passenger side of the car stopped the temperature hand from working completely. So I had to put the old one back in.
Dec 13, 2020 at 9:41 AM
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JACOBANDNICKOLAS
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Hi,

If the engine boils over and it is happening when you are driving, I would check the radiator to see if it is plugged. You have already done the thermostat.

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

Also, there could be an issue with a head gasket causing the issue. Take a look through this link and see if anything mirrors what you are experiencing:

https://www.2carpros.com/articles/head-gasket-blown-test

Let me know if any of that helps and what you find.

Take care,
Joe
Dec 13, 2020 at 9:35 PM