| 1 |
- Ensure that the cooling system is full.
- Allow the engine to cool.
- Start the engine.
- Turn the air conditioning system off.
- Inspect the engine cooling fan(s).
Is the electric cooling fan on? |
Go to Step 2 |
Go to Step 3 |
| 2 |
- Diagnose and repair the cooling fan system. DTC P0494, P30EE, P30EF, or U0632 - Cooling Fan Malfunction (LTG/LGX with Y4Q) , or DTC P0480, P0494, P0691, P0692, P30EE, P30EF, or U0632 - Cooling Fan Malfunction (LGX without Y4Q) , or DTC P0494, P30EE, P30EF, or U0632 - Cooling Fan Malfunction (LT1/LT4)
- Verify the customer complaint.
Does the engine still fail to reach normal operating temperature? |
Go to Step 3 |
System OK |
| 3 |
Install the Scan Tool to the DLC. Compare the Scan Tool coolant temperature reading to the I/P cluster coolant temperature.
Is the I/P cluster coolant temperature close to the reading on the Scan Tool? |
Go to Step 5 |
Go to Step 4 |
| 4 |
- Diagnose and repair the coolant temperature gauge system.
- Verify the customer complaint.
Does the engine still fail to reach normal operating temperature? |
Go to Step 5 |
System OK |
| 5 |
Inspect the thermostat for proper operation. Thermostat Diagnosis
Is the thermostat operating properly? |
Go to Step 1 |
Go to Step 6 |
| 6 |
- Replace the water outlet. Water Outlet Replacement (LGX) , or Water Outlet Replacement (LT1, LT4) , or Water Outlet Replacement (LTG)
- Verify the customer complaint.
Does the engine still fail to reach normal operating temperature? |
Go to Step 1 |
System OK |