Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: The engine temperature lamp comes ON and stays ON, or the temperature gage shows hot, or coolant overflows from the surge tank onto the ground while the engine is running. | ||||
1 | Check for a loss of coolant. Refer to Loss of Coolant . Is there a loss of coolant? | -- | Go to Step 2 | Go to Step 3 |
2 | Fill the system to the specified level. Refer to Cooling System Draining and Filling . Does the engine still overheat? | -- | Go to Step 3 | System OK |
3 | Check for kinked or pinched surge tank hoses, especially at the radiator. Are any surge tank hoses kinked or pinched? | -- | Go to Step 4 | Go to Step 5 |
4 |
Does the engine still overheat? | -- | Go to Step 5 | System OK |
5 | Check for loose, missing, or damaged radiator air seals or deflectors. Are there any loose, missing, or damaged radiator air seals or deflectors? | -- | Go to Step 6 | Go to Step 7 |
6 | Repair or replace any loose, missing, or damaged radiator air seals or deflectors. Refer to Radiator Air Side Baffle and Deflector Replacement or Radiator Air Upper Baffle and Deflector Replacement . Does the engine still overheat? | -- | Go to Step 7 | System OK |
7 | Check the coolant concentration. Does the coolant concentration test correctly? | -- | Go to Step 9 | Go to Step 8 |
8 | Replace the coolant if necessary. Refer to Cooling System Draining and Filling . Does the engine still overheat? | -- | Go to Step 9 | System OK |
9 |
Important: Use the correct pressure cap. Check the system for loss of pressure. Is there a loss of pressure? | -- | Go to Step 10 | Go to Step 11 |
10 | Repair any leaks as necessary. Does the engine still overheat? | -- | Go to Step 11 | System OK |
11 | Check for a faulty engine coolant temperature (ECT) sensor. Is the engine coolant temperature sensor faulty? | -- | Go to Step 12 | Go to Step 13 |
12 | Replace the ECT. Refer to Engine Coolant Temperature Sensor Replacement in Engine Controls - 2.2L (L61). Does the engine still overheat? | -- | Go to Step 13 | System OK |
13 | Check the radiator for any airflow obstructions or bent fins. Is there any airflow obstruction or bent fins? | -- | Go to Step 14 | Go to Step 15 |
14 |
Does the engine still overheat? | -- | Go to Step 15 | System OK |
15 | Check for any blocked cooling system passages. Are there any blocked cooling system passages? | -- | Go to Step 16 | Go to Step 17 |
16 |
Does the engine still overheat? | -- | Go to Step 17 | System OK |
17 | Check for an inoperative cooling fan. Is the cooling fan inoperative? | -- | Go to Step 18 | Go to Step 19 |
18 | Replace the cooling fan. Refer to Cooling Fan and Shroud Replacement . Does the engine still overheat? | -- | Go to Step 19 | System OK |
19 | Check for a thermostat that is stuck closed. Is the thermostat stuck closed? | -- | Go to Step 20 | Go to Step 21 |
20 | Replace the thermostat. Refer to Engine Coolant Thermostat Replacement . Does the engine still overheat? | -- | Go to Step 21 | System OK |
21 | Check for a faulty water pump. The impeller blades may be eroded or broken. Is the water pump faulty? | -- | Go to Step 22 | -- |
22 | Replace the water pump. Refer to Water Pump Replacement . Does the engine still overheat? | -- | -- | System OK |
