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Engine Fails To Reach Normal Operating Temperature

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
Engine Fails To Reach Normal Operating Temperature

Step Action Yes No
1 Inspect the thermostat for the following conditions:
  • The thermostat remains open.
  • An incorrect thermostat is installed.

Does either of the above conditions exist?		 Go to Step 2  Go to Step 3 
2 Install a new thermostat of the correct type and heat range.
Does the engine still fail to reach the normal operating temperature?		 Go to Step 3  System OK
3 Inspect the coolant level.
Is the coolant level below the ADD mark?		 Go to Step 4  Go to Step 5 
4 Add coolant.
Does the engine still fail to reach the normal operating temperature?		 Go to Step 5  System OK
5 Inspect the radiator for the following conditions:
  • Plugging
  • A faulty cap

Does either of the above conditions exist?		 Go to Step 6  Go to Step 7 
6
  1. Inspect the radiator or the cap.
  2. Replace the cap as necessary.
Does the engine reach the normal operating temperature?		 System OK Go to Step 7 
7 Inspect the cylinder head.
Is the cylinder head or block cracked or plugged?		 Go to Step 8  -
8 Repair the cylinder head or block as necessary.
Does the engine reach the normal operating temperature?		 System OK -
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