Step | Action | Value(s) | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Check for a loss of system pressure. Refer to Cooling System Leak Testing . Is there a loss of system pressure? | -- | ||||||||||
2 | Inspect and repair any faulty hose connections. Does the engine still overheat? | -- | System OK | |||||||||
3 | Check for low coolant protection (-37°C/-34°F). Refer to Coolant Concentration Testing . Is there low coolant protection (-37°C/-34°F)? | -- | ||||||||||
4 | Replace the coolant. Refer to Cooling System Draining and Filling . Does the engine still overheat? | -- | System OK | |||||||||
5 | Check the drive belt for excessive wear or low tension. Is the drive belt worn or is the tension too low? | -- | ||||||||||
6 | Replace the drive belt. Refer to the appropriate procedure:
Does the engine still overheat? | -- | System OK | |||||||||
7 | Check the water pump. Is the water pump inoperative? | -- | ||||||||||
8 | Replace the water pump. Does the engine still overheat? | -- | System OK | |||||||||
9 | Check the radiator fins for obstruction. Are the radiator fins obstructed? | -- | ||||||||||
10 | Inspect and clean the radiator. Does the engine still overheat? | -- | System OK | |||||||||
11 | Check the cooling system passage for obstruction. Is the cooling system passage blocked? | -- | ||||||||||
12 | Inspect and flush the system. Refer to Flushing . Does the engine still overheat? | -- | System OK | |||||||||
13 | Check the fan clutch, refer to Fan Clutch Diagnosis . Is the fan clutch inoperative? | -- | ||||||||||
14 | Replace the fan clutch. For the 4.3L, 5.0L, 5.7L and 6.5L engines, refer to Fan Clutch Replacement . For the 7.4L engine, refer to Fan Clutch Replacement . Does the engine still overheat? | -- | System OK | |||||||||
15 | Check for a stuck thermostat, refer to Thermostat Diagnosis . Is the thermostat stuck in the closed position? | -- | ||||||||||
16 | Replace the thermostat.
Does the engine still overheat? | -- | System OK | |||||||||
17 | Other factors, such as the following, may be causing the engine to overheat:
Correct or repair as necessary. Does the engine still overheat? | System OK |
