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

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

2 people found this helpful.
60

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

1 people found this helpful.

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

44,010

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.

1 people found this helpful.

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