Check the coolant level.

Is the coolant level below the add mark?

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Go to Step 2

Go to Step 3

1. Add coolant as necessary. Refer to Cooling System Leak Testing .
2. Perform a cooling system pressure test. Refer to Cooling System Leak Testing .

Is the repair complete?

--

System OK

--

Check for a stuck open, missing, or wrong type of coolant thermostat. Refer to Thermostat Diagnosis .

Is the thermostat operating properly?

--

System OK

Go to Step 4

Install the correct replacement thermostat. Refer to Engine Coolant Thermostat Replacement .

Is the repair complete?

--

System OK

--

Check the coolant level in the coolant recovery reservoir.

Is the coolant at the proper level?

--

Go to Step 3

Go to Step 2

Add coolant to the coolant recovery reservoir as necessary.

Does the engine still fail to reach normal operating temperature?

--

Go to Step 3

System OK

Check for a blockage in the coolant passages.

Are there any blockages in the coolant passages?

--

Go to Step 4

Go to Step 5

Flush the cooling system or flow check the radiator. Refer to Flushing .

Does the engine still fail to reach normal operating temperature?

--

Go to Step 5

System OK

Check to see if the incorrect type of thermostat was installed, or if the thermostat is stuck (or sticks) in the open position. Refer to Thermostat Diagnosis .

Was the incorrect thermostat installed, or is the thermostat stuck (or does the thermostat stick) in the open position?

--

Go to Step 6

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Replace the thermostat. Refer to Engine Coolant Thermostat Replacement .

Does the engine still reach normal operating temperature?

--

--

System OK