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Engine Fails To Reach Normal Operating Temperature

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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