Engine Overheating
Engine Overheating
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| 1 | Inspect for a loss of system pressure. Is there a loss of system pressure? |
- | Go to Step 2 | Go to Step 3 |
| 2 | Inspect and repair any faulty hose connections or radiator cap. Does the engine still overheat beyond the specified value? |
-37°F (-34°F) | Go to Step 3 | System OK |
| 3 | Inspect the coolant temperature for low temperature below the specified value. Is low temperature protection present? |
-37°F (-34°F) | Go to Step 5 | Go to Step 4 |
| 4 | Replace the coolant. Refer to Draining and Filling Cooling System . 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 - Accessory
. 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 the electro-viscous fan. Is the electro-viscous fan inoperative? |
- | Go to Step 14 | Go to Step 15 |
| 14 | Replace the electro-viscous fan. Does the engine still overheat? |
- | Go to Step 15 | System OK |
| 15 | Inspect for a stuck thermostat. Refer to Thermostat Diagnosis . Is the thermostat stuck in the closed position? |
- | Go to Step 16 | Go to Step 17 |
| 16 | Replace the thermostat. Refer to Thermostat Replacement . Does the engine still overheat? |
- | Go to Step 17 | System OK |
| 17 | The following factors may cause the engine to overheat:
Correct or repair as necessary. Does the engine still overheat? |
- | - | System OK |