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Step
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Action
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Yes
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No
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DEFINITION: The cooling system is losing coolant either
internally or externally.
Special Tools
BO-42220 Universal 12V Leak Detection Lamp
For equivalent regional tools, refer to
Special Tools .
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1
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Have you been sent here from Symptoms?
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Go to Step 2
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Go to
Symptoms - Engine Cooling
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2
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Repair any present DTCs. Refer to
Diagnostic System Check - Vehicle .
Is the action complete?
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Go to Step 3
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-
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3
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Inspect the coolant level.
Is the coolant at the proper level?
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Go to Step 5
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Go to Step 4
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4
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Fill the cooling system to the proper level. Refer to
Cooling System Draining and Filling .
Is the action complete?
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Go to Step 5
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-
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5
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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?
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Go to Step 6
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Go to Step 25
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6
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Engine overheating can cause a loss of coolant.
Is the engine overheating?
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Go to Step 28
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Go to Step 7
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7
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Extended operation with a low coolant level can cause engine
internal component failure.
Is the engine knocking?
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Go to Step 30
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Go to Step 8
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8
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- Idle the engine at normal operating temperature.
- Inspect for heavy white smoke coming out of the
exhaust pipe.
Is a heavy white smoke present from the exhaust pipe?
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Go to Step 9
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Go to Step 10
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9
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Coolant in the exhaust system creates a distinctive, burning
coolant odour in the exhaust.
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?
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Go to Step 29
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Go to Step 10
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10
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Warning: Refer to
Moving Parts and Hot Surfaces Warning
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?
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Go to Step 15
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Go to Step 11
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11
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Visually inspect the hoses, pipes and hose clamps at the
following locations:
Are any of the hoses, clamps or pipes leaking?
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Go to Step 21
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Go to Step 12
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12
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Visually inspect the following components:
| • |
The coolant pressure cap |
| • |
The cylinder head gaskets |
Are any of the listed components leaking?
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Go to Step 21
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Go to Step 13
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13
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- Pressure test the cooling system. Refer to
Cooling System Leak Testing .
- With the cooling system pressurised, visually inspect
the components listed in steps 11 and 12.
Are any leaks present?
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Go to Step 21
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Go to Step 14
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14
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Pressure test the coolant pressure cap.
Does the coolant pressure cap hold pressure?
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Go to Step 15
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Go to Step 22
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15
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Inspect for the following conditions:
| • |
A coolant smell inside of the vehicle |
| • |
Coolant in the HVAC module drain tube |
| • |
Coolant on the vehicle floor covering near the
HVAC module |
Is coolant present?
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Go to Step 23
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Go to Step 16
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16
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- Add 30 ml (1 oz) of Extended Life Coolant
Leak Detection Dye to the cooling system for each 15 L
(4 gal) of coolant. Refer to
Approximate Fluid Capacities .
- Start the vehicle and allow the engine to reach normal
operating temperature.
- Shut the engine off.
- Use BO 42220 detection lamp to visually
inspect the components listed in steps 11 and 12.
Are any leaks present?
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Go to Step 21
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Go to Step 17
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17
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Use BO 42220 detection lamp to inspect for the
following conditions:
| • |
Coolant dye in the HVAC module drain tube |
| • |
Coolant dye on the vehicle floor covering near the
HVAC module |
Is coolant dye present?
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Go to Step 23
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Go to Step 18
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18
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Inspect the underside of the engine oil fill cap for a
gray/white milky substance.
Is a milky substance under the oil fill cap?
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Go to Step 19
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Go to Step 20
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19
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Inspect the engine oil fluid level indicator for a gray/white
milky substance.
Is a milky substance on the engine oil fluid level
indicator?
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Go to Step 29
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Go to Step 20
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20
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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?
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Go to Step 24
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Go to Step 32
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21
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Repair or replace the leaking component. Refer to the
appropriate repair.
Is the repair complete?
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Go to Step 32
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-
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22
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Replace the coolant pressure cap.
Is the repair complete?
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Go to Step 32
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-
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23
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Replace the heater core. Refer to
Heater Core Replacement .
Is the repair complete?
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Go to Step 32
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-
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24
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- Remove the transmission oil cooler lines from the
radiator.
- Pressure test the cooling system. Refer to
Cooling System Leak Testing .
- Inspect the transmission oil cooler for coolant.
Is coolant present?
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Go to Step 25
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Go to Step 26
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25
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- Replace the radiator. Refer to
Radiator Replacement .
- Service the automatic transmission.
Is the repair complete?
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Go to Step 32
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-
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26
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Install the cooler lines to the radiator.
Is the action complete?
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Go to Step 32
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-
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27
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Repair the engine no crank condition.
Is the repair complete?
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Go to Step 32
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-
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28
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Repair the engine overheating condition.
Is the repair complete?
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Go to Step 32
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-
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29
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Repair the engine internal coolant leak.
Is the repair complete?
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Go to Step 32
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-
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30
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Repair the engine knock.
Is the repair complete?
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Go to Step 32
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-
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31
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Repair the combustion pressure in the cooling system
problem.
Is the repair complete?
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Go to Step 32
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-
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32
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Operate the system in order to verify the repair.
Did you find and correct the condition?
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System OK
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Go to Step 2
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