GM Service Manual Online
For 1990-2009 cars only

Engine Fails to Reach Normal Operating Temperature/Cool Air From the Heater

Cause

Correction

Thermostat stuck open or incorrect thermostat

Install a new thermostat of the correct type and of the correct heat range.

Coolant is below the ADD or below the LOW mark

Add coolant. Refer to Maintenance and Lubrication.

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