Step | Action | Yes | No | ||||
---|---|---|---|---|---|---|---|
1 | Inspect the coolant level. Is the coolant level low? | Go to Step 11 | Go to Step 2 | ||||
2 | Inspect the exhaust system for the following conditions:
Did you find and correct the condition? | Go to Step 22 | Go to Step 3 | ||||
3 | Inspect for a loose drive belt. Is the drive belt loose? | Go to Step 4 | Go to Step 5 | ||||
4 | Replace the drive belt. Refer to Drive Belt Replacement in Engine Mechanical -4.3L, Drive Belt Replacement - Accessory in Engine Mechanical - 4.8L, 5.3L and 6.0L, Drive Belt Replacement in Engine Mechanical - 6.6L or Drive Belt Replacement - Accessory in Engine Mechanical - 8.1L. Was the repair complete? | Go to Step 22 | -- | ||||
5 |
Is the radiator air flow obstructed? | Go to Step 6 | Go to Step 7 | ||||
6 | Clean the radiator. Refer to Radiator Cleaning . Was the repair complete? | Go to Step 22 | -- | ||||
7 | Inspect for an inoperative fan clutch. Refer to Fan Clutch Diagnosis . Is the fan clutch operating correctly? | Go to Step 9 | Go to Step 8 | ||||
8 | Replace the fan clutch. Refer to Fan Clutch Replacement . Was the repair complete? | Go to Step 22 | -- | ||||
9 | Inspect the thermostat. Refer to Thermostat Diagnosis . Is the thermostat stuck in the closed position? | Go to Step 10 | -- | ||||
10 | Replace the thermostat. Refer to Engine Coolant Thermostat Replacement . Was the repair complete? | Go to Step 22 | -- | ||||
11 |
Are there any external leaks? | Go to Step 21 | Go to Step 12 | ||||
12 | Perform a pressure test on the radiator cap. Does the radiator cap hold pressure? | Go to Step 14 | Go to Step 13 | ||||
13 | Replace the radiator cap. Was the repair complete? | Go to Step 22 | -- | ||||
14 | Inspect for combustion chamber gases leaking in the cooling system. Are bubbles present in the coolant? | Go to Step 19 | Go to Step 15 | ||||
15 | Inspect for a inoperative water pump. Is the water pump inoperative? | Go to Step 16 | Go to Step 17 | ||||
16 | Replace the water pump. Refer to Water Pump Replacement . Was the repair complete? | Go to Step 22 | -- | ||||
17 | Inspect for a blockage in the engine block coolant passages. Are the engine block coolant passages blocked? | Go to Step 18 | -- | ||||
18 | Perform the cooling system flush. Refer to Flushing . Was the repair complete? | Go to Step 22 | -- | ||||
19 | Check the engine oil. Is the engine oil foamy and/or milky? | Go to Step 20 | -- | ||||
20 |
Was a damaged/faulty component found? | Go to Step 21 | -- | ||||
21 | Replace and/or repair the component as necessary. Was the repair complete? | Go to Step 22 | -- | ||||
22 |
Does the engine overheat? | -- | System OK |