Sounds like you have an air pocket in the cooling system. It's also possible your coolant temp sensor or the wiring going to it is bad. Has any work been done to it lately such as a thermostat or water pump?
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2017 Krypton Green SS 1LE
Magnacharged 2000 Trans Am WS6 manual trans
2002 Trans Am
2015 Ram Crew Cab Cummins
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