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Overheating and then cooling off

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Old 20 Mar 2020, 05:36 am
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Join Date: Jun 2017
Posts: 6
Default Overheating and then cooling off

On my 2006 PT with the 2.4 NA engine, I recently replaced my Stant thermostat with a genuine Mopar thermostat because the engine would not reach normal operating temperature. Today, the first time I made a longer trip, the temperature started climbing above normal, and the warning light started flashing. A little bit later, before I could exit the freeway I was on, it started cooling off and reached the normal temp. The outside temperature was -1 C.

Does anybody have a clue, what happened?
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Old 20 Mar 2020, 07:35 am
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Join Date: Aug 2015
Location: Lake Wales, FL
Posts: 5,011
Default Re: Overheating and then cooling off

Sounds like you may have had an air pocket and it purged itself via the radiator cap and overflow bottle. I'd suggest your check your coolant level and top it off if necessary. Keep in mind I'm NOT a mechanic, though, so you may want to wait for other answers.

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Old 20 Mar 2020, 01:50 pm
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Join Date: Jan 2014
Location: SW PA
Posts: 1,357
Default Re: Overheating and then cooling off

Yes check your overflow bottle and make sure it is filled to the fill line, A weak radiator cap is another possibility, as the engine gets hot coolant expands and should go into the over flow bottle and as it cools water is drawn back into the cooling system. It takes a while to get all the air out of the cooling system, avoid overheating that will cause leaking head gasket and you don't want to go there.
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Old 20 Mar 2020, 03:02 pm
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Join Date: Jul 2016
Location: east central wisconsin
Posts: 172
Default Re: Overheating and then cooling off

First I would test the thermostat in almost boiling hot water. Rejoice if it's bad because the alternative could be bad news.
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