Step | Action | Yes | No | ||||||||||||||||||||
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DEFINITION: The cooling system is losing 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 Starting Point - Engine Cooling. Is the action complete? | Go to Step 3 | -- | ||||||||||||||||||||
3 | Inspect the coolant level at the surge tank. 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 | If the engine is suspected to have a coolant leak into a cylinder, the coolant can hydraulically lock the engine. Does the engine crankshaft rotate? | Go to Step 6 | Go to Step 24 | ||||||||||||||||||||
6 | Engine overheating can cause a loss of coolant. Is the engine overheating? | Go to Step 25 | Go to Step 7 | ||||||||||||||||||||
7 | Extended operation with a low coolant level can cause engine internal component failure. Is the engine knocking? | Go to Step 27 | Go to Step 8 | ||||||||||||||||||||
8 | Visually inspect the hoses, pipes and hose clamps at the following locations:
Are any of the hoses, clamps or pipes leaking? | Go to Step 20 | Go to Step 9 | ||||||||||||||||||||
9 | Visually inspect the following components:
Are any of the listed components leaking? | Go to Step 20 | Go to Step 10 | ||||||||||||||||||||
10 |
Are any leaks present? | Go to Step 20 | 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 21 | ||||||||||||||||||||
12 |
Is a heavy white smoke present from the exhaust pipe? | Go to Step 13 | Go to Step 14 | ||||||||||||||||||||
13 | 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 26 | Go to Step 14 | ||||||||||||||||||||
14 |
Warning: Refer to Moving Parts and Hot Surfaces Warning in the Preface section. With the engine idling, inspect the surge tank. Does the surge tank discharge coolant while the engine is idling? | Go to Step 28 | Go to Step 15 | ||||||||||||||||||||
15 | Inspect for the following conditions:
Is coolant present? | Go to Step 22 | Go to Step 16 | ||||||||||||||||||||
16 |
Are any leaks present? | Go to Step 20 | Go to Step 17 | ||||||||||||||||||||
17 | Use J 42220 to inspect for the following conditions:
Is coolant dye present? | Go to Step 22 | Go to Step 18 | ||||||||||||||||||||
18 | Inspect the engine oil for a gray/white milky substance. Is there a milky substance in the engine oil ? | Go to Step 26 | Go to Step 19 | ||||||||||||||||||||
19 | Inspect the transmission oil fluid for a gray/white milky substance. Does the transmission fluid contain a gray/white milky substance? | Go to Step 23 | Go to Step 29 | ||||||||||||||||||||
20 | Repair or replace the leaking component. Refer to the appropriate repair. Is the repair complete? | Go to Step 29 | -- | ||||||||||||||||||||
21 | Replace the coolant pressure cap. Is the repair complete? | Go to Step 29 | -- | ||||||||||||||||||||
22 | Replace the heater core. Refer to Heater Core Replacement. Is the repair complete? | Go to Step 29 | -- | ||||||||||||||||||||
23 |
Is the repair complete? | Go to Step 29 | -- | ||||||||||||||||||||
24 | Repair the engine no crank condition. Refer to Engine Will Not Crank - Crankshaft Will Not Rotate or Engine Will Not Crank - Crankshaft Will Not Rotate. Is the repair complete? | Go to Step 29 | -- | ||||||||||||||||||||
25 | Repair the engine overheating condition. Refer to Engine Overheating. Is the repair complete? | Go to Step 29 | -- | ||||||||||||||||||||
26 | Repair the engine internal coolant leak. Refer to Coolant in Combustion Chamber or Coolant in Engine Oil. Repair the engine internal coolant leak. Refer to Coolant in Combustion Chamber or Coolant in Engine Oil. Is the repair complete? | Go to Step 29 | -- | ||||||||||||||||||||
27 | Repair the engine knock. Refer to Lower Engine Noise, Regardless of Engine Speed or Lower Engine Noise, Regardless of Engine Speed. Is the repair complete? | Go to Step 29 | -- | ||||||||||||||||||||
28 | Repair the combustion pressure in the cooling system problem. Refer to Cylinder Leakage Test or Cylinder Leakage Test. Is the repair complete? | Go to Step 29 | -- | ||||||||||||||||||||
29 | Operate the system in order to verify the repair. Did you find and correct the condition? | System OK | Go to Step 2 |