My thermostat gauge shows hot but the engine is not hot

Asked by MurphC Apr 30, 2018 at 08:50 PM about the 2003 Cadillac DeVille Sedan FWD

Question type: Maintenance & Repair

I have a 2003 Cadillac Deville 117,000
miles. When on the highway the
thermostat goes up a couple of bar
and occasionally but then goes right
back down. Sometime it will go up all
the way and give all the alarms that the
car has overheated but then go right
back down to normal. I have had the
relay fans replaced. Pressure tested,
everything I know to do. Anybody
experienced this problem?

1 Answer
9,495

brotherben answered 5 years ago

Your thermostat needs replaced. Your problem is caused the the thermostat hanging up and not allowing coolant to flow and overheating

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