Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Check for a loss of system pressure. Is there a loss of system pressure? | -- | Go to Step 2 | Go to Step 3 |
2 | Check the hoses for loose connections. Repair any loose connections. Does the engine still overheat? | -- | Go to Step 3 | System OK |
3 | Check for low coolant protection (-37°C/-34°F). Refer to Coolant Concentration Testing . Is the coolant protection low? | -- | Go to Step 4 | Go to Step 5 |
4 |
| -- | Go to Step 5 | System OK |
5 | Check the water pump belt for low tension. Is the water pump belt tension too low? | -- | Go to Step 6 | Go to Step 7 |
6 | Replace the water pump belt tensioner. Does the engine still overheat? | -- | Go to Step 7 | System OK |
7 | Check for an inoperative water pump. Is the water pump inoperative? | -- | Go to Step 10 | Go to Step 11 |
8 | Replace the water pump. Refer to Water Pump Replacement . Does the engine still overheat? | -- | Go to Step 11 | System OK |
9 | Check for obstructed radiator fins. Are the radiator fins obstructed? | -- | Go to Step 12 | Go to Step 13 |
10 | Clean the radiator fins. Does the engine still overheat? | -- | Go to Step 13 | System OK |
11 | Check for a blocked system passage. Is the system passage blocked? | -- | Go to Step 14 | Go to Step 15 |
12 |
Does the engine still overheat? | -- | Go to Step 15 | System OK |
13 | Check the water pump for damage to the belt. Is the belt damaged? | -- | Go to Step 16 | Go to Step 17 |
14 | Replace the accessory drive belt. Does the engine still overheat? | -- | Go to Step 17 | System OK |
15 | Check for inoperative cooling fan. Is the cooling fan inoperative? | -- | Go to Step 18 | Go to Step 19 |
16 | Check and repair electrical connector. Does the engine still overheat? | -- | Go to Step 19 | System OK |
17 | Check for restricted throttle body circuit flow. Is the throttle body circuit flow restricted? | -- | Go to Step 18 | Go to Step 19 |
18 | Inspect and clear the orifice and the associated hose. Does the engine still overheat? | -- | Go to Step 18 | System OK |
19 | Check the thermostat to see if it is in a closed position. Is the thermostat in a closed position? | -- | Go to Step 20 | -- |
20 | Replace the thermostat. Refer to Engine Coolant Thermostat Replacement . Does the engine still overheat? | -- | -- | System OK |
