DEFINITION: The cooling system is loosing coolant either internally or externally.

Were you sent here from Symptoms, or another diagnostic table?

Go to Step 2

Go to Symptoms

Repair any present DTCs. Refer to Diagnostic System Check - Vehicle .

Is the action complete?

Go to Step 3

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Inspect the coolant level.

Is the coolant at the proper level?

Go to Step 5

Go to Step 4

Fill the cooling system to the proper level. Refer to Cooling System Draining and Filling .

Is the action complete?

Go to Step 5

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Engine overheating can cause a loss of coolant.

Is the engine overheating?

Go to Step 16

Go to Step 6

1. Idle the engine at normal operating temperature.
2. Inspect for heavy white smoke coming out of the exhaust pipe.

Is a heavy white smoke present from the exhaust pipe?

Go to Step 7

Go to Step 8

1. Coolant in the exhaust system creates a distinctive, burning coolant odour in the exhaust.
2. Condensation in the exhaust system can cause an odourless white smoke during engine warm up.

Does the white smoke have a burning coolant type odour?

Go to Step 17

Go to Step 8

Visually inspect the hoses, pipes and hose clamps.

Are any of the hoses, clamps or pipes leaking?

Go to Step 18

Go to Step 9

Visually inspect the following components:

Are any of the listed components leaking?

Go to Step 18

Go to Step 10

1. Pressure test the cooling system. Refer to Cooling System Leak Testing .
2. With the cooling system pressurised, visually inspect the components listed in steps 8 and 9.

Are any leaks present?

Go to Step 18

Go to Step 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 15

Inspect for the following conditions:

Is coolant present?

Go to Step 18

Go to Step 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 19

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 19

Replace the coolant pressure cap.

Is the repair complete?

Go to Step 19

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Repair the engine overheating condition. Refer to Engine Overheating .

Is the repair complete?

Go to Step 19

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Repair the engine internal coolant leak.

Is the repair complete?

Go to Step 19

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Repair or replace the leaking component. Refer to the appropriate repair.

Is the repair complete?

Go to Step 19

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Operate the system in order to verify the repair.

Did you find and correct the condition?

System OK

Go to Step 2