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DEFINITION: The cooling system is loosing coolant either internally or externally. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
1 | Were you sent here from symptoms or another diagnostic table? | Go to Step 2 | |||||||||||||||||||||||||||||||||||||||||||||||||||
2 | Repair any present DTCs. Refer to Diagnostic System Check - Engine Cooling . Is the action complete? | Go to Step 3 | -- | ||||||||||||||||||||||||||||||||||||||||||||||||||
3 | Inspect the coolant level. Is the coolant at the proper level? | Go to Step 5 | Go to Step 4 | ||||||||||||||||||||||||||||||||||||||||||||||||||
4 | Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling . Is the action complete? | Go to Step 5 | -- | ||||||||||||||||||||||||||||||||||||||||||||||||||
5 | Engine overheating can cause a loss of coolant. Is the engine overheating? | Go to Step 19 | Go to Step 6 | ||||||||||||||||||||||||||||||||||||||||||||||||||
6 |
Is a heavy white smoke present from the exhaust pipe? | Go to Step 7 | Go to Step 8 | ||||||||||||||||||||||||||||||||||||||||||||||||||
7 | Coolant in the exhaust system creates a distinctive, burning coolant odor in the exhaust. Condensation in the exhaust system can cause an odorless white smoke during engine warm up. Does the white smoke have a burning coolant type odor? | Go to Step 20 | Go to Step 8 | ||||||||||||||||||||||||||||||||||||||||||||||||||
8 | Visually inspect the hoses, pipes and hose clamps. Are any of the hoses, clamps or pipes leaking? | Go to Step 21 | Go to Step 9 | ||||||||||||||||||||||||||||||||||||||||||||||||||
9 | Visually inspect the following components:
Are any of the listed components leaking? | Go to Step 21 | Go to Step 10 | ||||||||||||||||||||||||||||||||||||||||||||||||||
10 |
Are any leaks present? | Go to Step 21 | Go to Step 11 | ||||||||||||||||||||||||||||||||||||||||||||||||||
11 | Pressure test the coolant pressure cap. Refer to Pressure Cap Testing . Does the coolant pressure cap hold pressure? | Go to Step 12 | Go to Step 16 | ||||||||||||||||||||||||||||||||||||||||||||||||||
12 | Inspect for the following conditions:
Is coolant present? | Go to Step 21 | Go to Step 13 | ||||||||||||||||||||||||||||||||||||||||||||||||||
13 | Inspect the underside of the engine oil fill cap for a gray/white milky substance. Is there a milky substance under the oil fill cap? | Go to Step 14 | Go to Step 15 | ||||||||||||||||||||||||||||||||||||||||||||||||||
14 | Inspect the engine oil fluid level indicator for a gray/white milky substance. Is there a milky substance on the engine oil fluid level indicator? | Go to Step 17 | Go to Step 15 | ||||||||||||||||||||||||||||||||||||||||||||||||||
15 | Inspect the automatic transmission oil fluid level indicator, if equipped, for a gray/white milky substance. Is there a milky substance on the automatic transmission fluid level indicator? | Go to Step 18 | Go to Step 22 | ||||||||||||||||||||||||||||||||||||||||||||||||||
16 | Replace the coolant pressure cap. Is the repair complete? | Go to Step 22 | -- | ||||||||||||||||||||||||||||||||||||||||||||||||||
17 |
Is the repair complete? | Go to Step 22 | -- | ||||||||||||||||||||||||||||||||||||||||||||||||||
18 |
Is the repair complete? | Go to Step 22 | -- | ||||||||||||||||||||||||||||||||||||||||||||||||||
19 | Repair the engine overheating condition. Refer to Engine Overheating . Is the repair complete? | Go to Step 22 | -- | ||||||||||||||||||||||||||||||||||||||||||||||||||
20 | Repair the engine internal coolant leak. Refer to Coolant in Combustion Chamber in Engine Mechanical - 4.3L or Coolant in Combustion Chamber in Engine Mechanical - 4.8L, 5.3L, and 6.0L or Coolant in Combustion Chamber in Engine Mechanical - 6.6L (LB7) or Coolant in Combustion Chamber in Engine Mechanical - 6.6L (LLY) or Coolant in Combustion Chamber in Engine Mechanical - 8.1L or Coolant in Engine Oil in Engine Mechanical - 4.3L or Coolant in Engine Oil in Engine Mechanical - 4.8L, 5.3L, and 6.0L or Coolant in Engine Oil in Engine Mechanical - 6.6L (LB7) or Coolant in Engine Oil in Engine Mechanical - 6.6L (LLY) or Coolant in Engine Oil in Engine Mechanical - 8.1L. Is the repair complete? | Go to Step 22 | -- | ||||||||||||||||||||||||||||||||||||||||||||||||||
21 | Repair or replace the leaking component. Refer to the appropriate repair. Is the repair complete? | Go to Step 22 | -- | ||||||||||||||||||||||||||||||||||||||||||||||||||
22 | Operate the system in order to verify the repair. Did you find and correct the condition? | System OK | Go to Step 2 |