Symptom Chart

WARNING: This page is about a different car, the 2014 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
Loss of coolant	Coolant hoses or tubes Hose clamps Coolant pump O-ring seal Thermostat O-ring seal Thermostat housing Radiator Transmission fluid cooler (in radiator) (may leak internally or externally) Coolant expansion tank Degas bottle Pressure relief cap Coolant pump leaking from weep hole Cylinder block coolant pump hole cover Heater core Coolant crossover manifold assembly Engine gaskets (may leak internally or externally) Oil filter adapter (may leak internally or externally) Oil cooler (may leak internally or externally) Cylinder block core plugs Cylinder head core plugs Block heater (if equipped) Turbochargers (if equipped)	GO to PINPOINT TEST A .
The engine overheats	Low coolant level External engine coolant leak Airlock in system Pressure relief cap installation Restricted airflow through the A/C condenser/radiator Internal engine coolant leak Coolant condition/concentration Accessory drive components Non-OEM engine enhancement components Electric cooling fan Radiator Thermostat Temperature gauge Cylinder Head Temperature (CHT) sensor Coolant pump Coolant flow restriction	GO to PINPOINT TEST B .
The engine does not reach normal operating temperature	Low coolant level Thermostat Electric cooling fan always on ECT gauge CHT sensor	GO to PINPOINT TEST C .
The block heater does not operate correctly	Block heater power cable	CHECK continuity in all 3 power cable circuits. If any circuit measures more than 5 ohms, INSTALL a new power cable.
The block heater does not operate correctly	Block heater	CHECK the resistance of the block heater. If the resistance does not measure between 30 and 40 ohms, INSTALL a new block heater.
The electric cooling fan is inoperative in one or more speeds or does not operate correctly	Wiring Relays Fuses Cooling fan motor	REFER to the ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) (SECTION 0) .
The electric cooling fan stays on all the time	Wiring Relays	REFER to the ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) (SECTION 0) .
Noisy electric cooling fan	Foreign material contamination Fan motor	REMOVE the foreign material from the cooling fan and shroud. TEST the system for normal operation. If still noisy, INSTALL a new cooling fan assembly.
Noisy electric cooling fan	Fan blade detached from fan motor	INSTALL a new cooling fan assembly.