Step | Action | Yes | No | ||||||||||||||||||||||
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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 Starting Point - 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 | If the engine is suspected to have a coolant leak into the cylinder, the coolant can hydraulically lock the cylinder. Does the engine crankshaft rotate? | Go to Step 6 | Go to Step 30 | ||||||||||||||||||||||
6 | Engine overheating can cause a loss of coolant. Is the engine overheating? | Go to Step 31 | Go to Step 7 | ||||||||||||||||||||||
7 | Extended engine operation with a low coolant level can cause engine internal component failure. Is the engine knocking? | Go to Step 33 | Go to Step 8 | ||||||||||||||||||||||
8 |
Is a heavy white smoke present from the exhaust pipe? | Go to Step 9 | Go to Step 10 | ||||||||||||||||||||||
9 |
Does the white smoke have a burning coolant type odor? | Go to Step 32 | Go to Step 10 | ||||||||||||||||||||||
10 |
Caution: Refer to Moving Parts and Hot Surfaces Caution in the Preface section. With the engine idling, inspect the coolant recovery system. Does the coolant recovery system discharge coolant while the engine is idling? | Go to Step 15 | Go to Step 11 | ||||||||||||||||||||||
11 | Visually inspect the hoses, pipes and hose clamps at the following locations:
Are any of the hoses, clamps or pipes leaking? | Go to Step 23 | Go to Step 12 | ||||||||||||||||||||||
12 | Visually inspect the following components:
Are any of the listed components leaking? | Go to Step 23 | Go to Step 13 | ||||||||||||||||||||||
13 |
Are any leaks present? | Go to Step 23 | Go to Step 14 | ||||||||||||||||||||||
14 | Pressure test the coolant pressure cap. Refer to Pressure Cap Testing . Does the coolant pressure cap hold pressure? | Go to Step 16 | Go to Step 24 | ||||||||||||||||||||||
15 | Pressure test the coolant pressure cap. Refer to Pressure Cap Testing . Does the coolant pressure cap hold pressure? | Go to Step 34 | Go to Step 24 | ||||||||||||||||||||||
16 | Inspect for the following conditions:
Is coolant present? | Go to Step 25 | Go to Step 17 | ||||||||||||||||||||||
17 | If equipped with auxiliary heating, inspect for the following:
Is coolant present? | Go to Step 26 | Go to Step 18 | ||||||||||||||||||||||
18 |
Are any leaks present? | Go to Step 23 | Go to Step 19 | ||||||||||||||||||||||
19 | Use J 42220 to inspect for the following conditions:
Is coolant dye present? | Go to Step 25 | Go to Step 20 | ||||||||||||||||||||||
20 | Inspect the underside of the oil fill cap for a gray/white milky substance. Is there a milky substance under the oil fill cap? | Go to Step 21 | Go to Step 22 | ||||||||||||||||||||||
21 | 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 32 | Go to Step 22 | ||||||||||||||||||||||
22 | 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 27 | Go to Step 35 | ||||||||||||||||||||||
23 | Repair or replace the leaking component. Refer to the appropriate repair. Is the repair complete? | Go to Step 35 | -- | ||||||||||||||||||||||
24 | Replace the coolant pressure cap. Is the repair complete? | Go to Step 35 | -- | ||||||||||||||||||||||
25 | Replace the heater core. Refer to Heater Core Replacement . Is the repair complete? | Go to Step 35 | -- | ||||||||||||||||||||||
26 | Replace the auxiliary heater core. Refer to Auxiliary Heater Core Replacement . Is the repair complete? | Go to Step 35 | -- | ||||||||||||||||||||||
27 |
Is coolant present in the transmission oil cooler? | Go to Step 28 | Go to Step 29 | ||||||||||||||||||||||
28 |
Is the repair complete? | Go to Step 35 | -- | ||||||||||||||||||||||
29 | Install the cooler lines to the radiator. Is the action complete? | Go to Step 35 | -- | ||||||||||||||||||||||
30 | Repair the engine no crank condition. Refer to one of the following procedures:
Is the repair complete? | Go to Step 35 | -- | ||||||||||||||||||||||
31 | Repair the engine overheating condition. Refer to Engine Overheating . Is the repair complete? | Go to Step 35 | -- | ||||||||||||||||||||||
32 | Repair the engine internal coolant leak. Refer to one of the following procedures:
Is the repair complete? | Go to Step 35 | -- | ||||||||||||||||||||||
33 | Repair the engine knock. Refer to one of the following procedures:
Is the repair complete? | Go to Step 35 | -- | ||||||||||||||||||||||
34 | Repair the combustion pressure in the cooling system problem. Refer to one of the following procedures:
Is the repair complete? | Go to Step 35 | -- | ||||||||||||||||||||||
35 | Operate the system in order to verify the repair. Did you find and correct the condition? | System OK | Go to Step 2 |