Engine Fails To Reach Normal Operating Temperature

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
1	Did you review the Symptoms - Engine Cooling diagnostic information and perform the necessary inspections?	Go to Step 2	Go to Symptoms - Engine Cooling
2	Verify that the engine does not reach normal operating temperature. Does the engine reach normal operating temperature?	System OK	Go to Step 3
3	Inspect the coolant level. Is the coolant level below the add mark?	Go to Step 4	Go to Step 5
4	Add coolant as necessary. Perform a cooling system pressure test. Does the cooling system hold pressure?	System OK	Go to Step 5
5	Inspect for a stuck open, missing, or incorrect thermostat. Refer to Thermostat Diagnosis . Is the thermostat operating properly?	System OK	Go to Step 6
6	Install the correct replacement thermostat. Refer to Engine Coolant Thermostat Housing Replacement (LY2, LH6, LY5, LMG, LY6) . Is the repair complete?	Go to Step 7	-
7	Run the engine in order to verify the repair. Does the engine fail to reach normal operating temperature?	-	System OK