Visually inspect the engine coolant level at the degas bottle and adjust as necessary. Pressure test the engine cooling system. Refer to Component Tests , Cooling System Pressure Test.
Does the engine cooling system leak externally?
Yes | REPAIR or INSTALL new components. |
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No | GO to A3 |
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A3 CHECK THE ENGINE COOLANT FOR AN INTERNAL LEAK
Inspect the engine coolant in the degas bottle for signs of engine oil.
Is engine oil evident in the engine coolant?
Yes | REFER to: appropriate Engine article. |
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No | GO to A4 |
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A4 CHECK THE ENGINE OIL FOR COOLANT
Remove the oil level indicator from the engine.
Is coolant evident in the oil?
Yes | REFER to: appropriate Engine article. |
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No | GO to A5 |
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NOTE: Use UView® Combustion Leak Tester part number UVU560000-R or equivalent.
A5 CHECK THE COOLING SYSTEM FOR COMBUSTION GASES
Using a cooling system combustion gas leak tester, following the instructions supplied with the tester, check the coolant for combustion gases.
Are combustion gases present?
Yes | REFER to: appropriate Engine article. |
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Original technical text and illustrations, formatted as HTML. Follow the engine, transmission, equipment, model and year specified in the source. Import and layout checks do not establish applicability to every 2015–2017 Mustang. About this collection.