1. Verify the customer concern.
2. Visually check the engine coolant level at the degas bottle when the system is cold.
3. Make sure the pressure relief cap is installed correctly.
4. Record any cooling system Diagnostic Trouble Codes (DTCs) retrieved. Refer to the PCM DTC chart in DTC Chart for DTC descriptions.
NOTE: Take note of any coolant odor or steam coming from cooling system components.
5. If the system coolant is filled correctly and no Diagnostic Trouble Codes (DTCs) associated with fail-safe cooling are retrieved, verify the customer concern by operating the engine to duplicate the condition.
6. Visually inspect for obvious signs of any mechanical or electrical damage.
Visual Inspection Chart
Mechanical | Electrical |
Leaks or weeps at: Hoses Tubes Clamp joints Gaskets O-rings
Inoperative or damaged:
Thermostat housing
Electric cooling fan
Radiator
Wiring, connectors, relays or modules
Pressure relief cap
CHT sensor
Coolant pump
ECT sensor
Heater core (wet floor or coolant odor in vehicle) Degas bottle Cylinder block core plugs Cylinder head core plugs Block heater (if equipped)
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.