Coolant temperature at idle
60

Asked by Jmarv785 Feb 08, 2019 at 06:45 PM about the 1998 Cadillac DeVille Sedan FWD

Question type: Maintenance & Repair

The coolent temperature on my dash reaches
224°F at idle after 20 min. Is this normal?

8 Answers
60

Jmarv785 answered 5 years ago

The northstar motor is self purging. Would there still be air in the system?

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60

Jmarv785 answered 5 years ago

And i took out the thermostat and tested it in boiling water. It opens....

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F_O_R answered 5 years ago

You may have the Northstar curse. Head bolts pull out causing leaking head gaskets.

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43,910

Hornet_2497 answered 5 years ago

That high temperature reading might just be a false reading from a bad temperature sensor. Take an infrared temperature sensor tool and take a reading off the cooling system, maybe near the thermostat or upper radiator hose.

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