Step | Action | Values | Yes | No | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Inspect for a loss of system pressure and/or coolant. Is there a loss of system pressure and/or coolant? | -- | Go to Step 2 | Go to Step 3 | ||||||||||
2 | Inspect and repair any faulty hose connections or radiator cap. Fill the system to the proper level, then retest. Does the engine still overheat beyond the specified value? | 125°C (257°F) | Go to Step 3 | System OK | ||||||||||
3 | Inspect the coolant concentration for low temperature protection below the specified value. Is the proper low temperature protection present? | -37°C (-34°F) | Go to Step 5 | Go to Step 4 | ||||||||||
4 | Replace the coolant. Refer to Cooling System Draining and Filling . Does the engine still overheat? | -- | Go to Step 5 | System OK | ||||||||||
5 | Inspect the drive belt for excessive wear or low tension. Is the drive belt worn or is the tension too low? | -- | Go to Step 6 | Go to Step 7 | ||||||||||
6 | Replace the drive belt. Refer to Drive Belt Replacement . Does the engine still overheat? | -- | Go to Step 7 | System OK | ||||||||||
7 | Inspect the radiator fins for obstruction. Are the radiator fins obstructed? | -- | Go to Step 8 | Go to Step 9 | ||||||||||
8 | Inspect and clean the radiator. Refer to Radiator Cleaning . Does the engine still overheat? | -- | Go to Step 9 | System OK | ||||||||||
9 | Inspect the water pump for physical damage. Is the water pump damaged or inoperative? | -- | Go to Step 10 | Go to Step 11 | ||||||||||
10 | Replace the water pump. Refer to Water Pump Replacement . Does the engine still overheat? | -- | Go to Step 11 | System OK | ||||||||||
11 | Inspect the cooling system passages for obstruction. Is the cooling system passage blocked? | -- | Go to Step 12 | Go to Step 13 | ||||||||||
12 | Inspect and flush the system. Refer to Flushing . Does the engine still overheat? | -- | Go to Step 13 | System OK | ||||||||||
13 | Inspect for an inoperative fan clutch. Refer to Fan Clutch Diagnosis. Does the engine still overheat? | -- | Go to Step 14 | System OK | ||||||||||
14 | Inspect for a stuck 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 Replacement . Does the engine still overheat? | -- | Go to Step 16 | System OK | ||||||||||
16 | The following factors may cause the engine to overheat:
Correct or repair as necessary. Does the engine still overheat? | -- | -- | System OK |
