1. Check the level of the coolant in the radiator surge tank. Refer to Cooling System Maintenance Recommendations .
2. Add engine coolant as necessary.

Does the engine reach normal operating temperature now?

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System OK

Go to Step 2

1. Check for a blockage in the coolant passages.
2. Flush the cooling system or flow check the radiator. Refer to Flushing .

Does the engine reach normal operating temperature now?

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System OK

Go to Step 3

1. Check to see if the correct type of thermostat was installed.
2. Check if the thermostat is stuck in the open position. Refer to Thermostat Diagnosis .
3. If necessary, replace the thermostat. Refer to Engine Coolant Thermostat Replacement .

Does the engine reach normal operating temperature?

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System OK

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