Are any active grill shudder DTCs present?
Yes | REFER to: Active Grille Shutter . |
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No | GO to B4 |
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NOTE: Verify no vehicle front end damage is present.
Check the radiator or A/C condenser for an external obstruction such as leaves or cardboard and verify all air deflectors are present.
B4 CHECK FOR AN AIRFLOW OBSTRUCTION AND MISSING AIR DEFLECTORS
Is an airflow obstruction present or air deflectors missing?
Yes | REPAIR as necessary. |
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No | GO to B5 |
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B5 CHECK THE ENGINE COOLANT LEVEL AND PRESSURE TEST THE COOLING SYSTEM
Ignition OFF.
Visually check the engine coolant level in the coolant expansion tank and adjust as necessary. Pressure test the cooling system.
Does the engine cooling system leak externally?
Yes | REPAIR or INSTALL new components. |
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No | GO to B6 |
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B6 CHECK THE ENGINE COOLANT FOR AN INTERNAL LEAK
Inspect the engine coolant in the coolant expansion tank for signs of engine oil.
Is engine oil evident in the coolant?
Yes | REFER to: appropriate Engine article. |
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No | GO to B7 |
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B7 CHECK THE ENGINE OIL FOR COOLANT
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.