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I once changed the prestone on my car (Chevy 97)and after that, the temperature went from normal to a little hot. I changed the thermostat and temperature went back to normal. I assume the new prestone made the thermostat more "stiky" and It could not open as freely as before. Hope this help Normand Also make sure there are no air pockets in your cooling system, but most likely it is an intermittent problem with your thermostat, they are cheap and easy to change, I change my thermostats almost once a year anyway. If after all of this you are having the same problem then maybe the temperature sending unit could be corroded or faulty or the water pump impeller could be worn. With the gauge at about half way or a tad higher the cooling fan should kick on and the Temp. gauge should fall rather quickly within a couple minutes to about a third of the way.Then the fan shuts off. Does your cooling fan run? Do you ever hear a gurgling sound from under the hood or under the dash? The gurgling sound would indicate air trapped in your cooling system. I hope this helps as well, Randy...

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โˆ™ 2007-01-03 01:43:08
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Q: Why is your Chevy cavalier temperature gage running from normal to a little hot could you have a bad thermostat?
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