Inspect for a stuck OPEN or missing coolant thermostat. Refer to Thermostat Diagnosis .

Is the thermostat operating properly?

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Go to Step 3

Go to Step 2

Install the correct replacement thermostat.

Is the repair complete?

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System OK

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Inspect the coolant level.

Is the coolant level below the add mark?

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Go to Step 4

System OK

1. Add the coolant as necessary.
2. Use the specified coolant concentration. Refer to Coolant Concentration Testing .

Is the concentration level according to the specification?

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System OK

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