Step | Action | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|
1 | Inspect for a missing or damaged radiator side or upper baffle and/or radiator air deflector. Is the baffle and/or deflector missing or damaged? | Go to Step 8 | Go to Step 2 | ||||||
2 | Inspect for a loss of coolant. Is there a loss of coolant? | Go to Step 3 | Go to Step 4 | ||||||
3 | Fill the system to the specified level. Does the engine overheat? | Go to Step 4 | System OK | ||||||
4 | Inspect for low temperature protection. Is the coolant to the correct concentration? | Go to Step 5 | Go to Step 8 | ||||||
5 | Inspect for a loss of cooling system pressure. Is there a loss of system pressure? | Go to Step 8 | Go to Step 6 | ||||||
6 | Inspect for a faulty engine coolant temperature (ECT) sensor. Refer to DTC P0117 , DTC P0118 in Engine Controls - 4.8L, 5.3L, and 6.0L, or to DTC P0117 , DTC P0118 in Engine Controls - 8.1L. Is the sensor operating properly? | Go to Step 7 | Go to Step 8 | ||||||
7 | Inspect for the following:
Were any of the above found? | Go to Step 8 | Go to Step 3 | ||||||
8 | Repair or install new parts as necessary, then retest. Does the engine overheat? | Go to Step 9 | System OK | ||||||
9 | Inspect for incorrect drive belt tension. Is the belt tension correct? | Go to Step 10 | Go to Step 8 | ||||||
10 |
Is the water pump driveshaft damaged or is the seal leaking? | Go to Step 8 | Go to Step 11 | ||||||
11 | Inspect for obstructed radiator air flow or bent radiator fins. Is the radiator air flow obstructed? | Go to Step 8 | Go to Step 12 | ||||||
12 | Inspect for blocked cooling system passages. Are the cooling system passages blocked? | Go to Step 8 | Go to Step 13 | ||||||
13 | Inspect for inoperative fan clutch. Refer to Fan Clutch Diagnosis . Is the fan clutch operating correctly? | Go to Step 14 | Go to Step 8 | ||||||
14 | Inspect the thermostat. Refer to Thermostat Diagnosis . Is the thermostat stuck in the closed position? | Go to Step 15 | Go to Step 16 | ||||||
15 | Replace the thermostat. Refer to Engine Coolant Thermostat Housing Replacement or Engine Coolant Thermostat Replacement . Does the engine overheat? | Go to Step 16 | System OK | ||||||
16 | Inspect the radiator cooling capacity. Is the proper sized radiator being used on the vehicle? | Go to Step 3 | Go to Step 17 | ||||||
17 | Consult the current parts catalog and replace the radiator. Refer to Radiator Replacement . Is the repair complete? | System OK | -- |
