Step | Action | Yes | No |
|---|---|---|---|
1 | Did you review the Symptom - Engine Cooling diagnostic information and perform the necessary inspections? | Go to Step 2 | |
2 | Verify that the engine does not reach normal operating temperature. Does the engine reach normal operating temperature? | System OK | Go to Step 3 |
3 | Inspect the coolant level. Is the coolant level below the add mark? | Go to Step 4 | Go to Step 5 |
4 |
Does the cooling system hold pressure? | System OK | Go to Step 5 |
5 | Inspect for a stuck open, missing, or incorrect thermostat. Refer to Thermostat Diagnosis . Is the thermostat operating properly? | Go to Step 6 | Go to Step 8 |
6 | Is the vehicle equipped with a 6.6L, 7.2L or 7.8L diesel engine? | Go to Step 7 | Go to Step 8 |
7 | Inspect for a faulty turbocharger coolant bypass valve. Is the turbocharger coolant bypass valve functioning properly? | -- | Go to Step 9 |
8 | Install the correct replacement thermostat. Refer to Engine Coolant Thermostat Replacement . Is the repair complete? | Go to Step 10 | -- |
9 | Install a new turbocharger coolant bypass valve. Refer to Turbocharger Coolant Bypass Valve Replacement . Is the repair complete? | Go to Step 10 | -- |
10 | Run the engine in order to verify the repair. Does the engine fail to reach normal operating temperature? | -- | System OK |
