2017-Fiesta-Owners Manual

Maintenance

Severe Climates If you drive in extremely cold climates: • It may be necessary to increase the coolant concentration above 50%. • A coolant concentration of 60% provides improved freeze point protection. Coolant concentrations above 60% decrease the overheat protection characteristics of the coolant and may cause engine damage. If you drive in extremely hot climates: • You can decrease the coolant concentration to 40%. • Coolant concentrations below 40% decrease the freeze and corrosion protection characteristics of the coolant and may cause engine damage. Vehicles driven year-round in non-extreme climates should use prediluted coolant for optimum cooling system and engine protection. Coolant Change At specific mileage intervals, as listed in the scheduled maintenance information, the coolant should be changed. Add prediluted coolant approved to the correct specification. See Capacities and Specifications (page 243). Fail-Safe Cooling Fail-safe cooling allows you to temporarily drive your vehicle before any incremental component damage occurs. The fail-safe distance depends on ambient temperature, vehicle load and terrain. How Fail-Safe CoolingWorks If the engine begins to overheat, the coolant temperature gaugemoves toward the red zone:

A warning lamp illuminates and a message may appear in the information display.

If the engine reaches a preset over-temperature condition, the engine automatically switches to alternating cylinder operation. Each disabled cylinder acts as an air pump and cools the engine. When this occurs, your vehicle still operates, however: • Engine power is limited. • The air conditioning system turns off. Continued operation increases the engine temperature, causing the engine to completely shut down. Your steering and braking effort increases in this situation. When the engine temperature cools, you can re-start the engine. Have your vehicle checked as soon as possible to minimize engine damage. When Fail-SafeMode Is Activated WARNINGS Fail-safe mode is for use during emergencies only. Operate your vehicle in fail-safemode only as long as necessary to bring your vehicle to rest in a safe location and seek immediate repairs. When in fail-safe mode, your vehicle will have limited power, will not be able tomaintainhigh-speedoperation, and may completely shut down without warning, potentially losing engine power, power steering assist, and power brake assist, which may increase the possibility of a crash resulting in serious injury. Never remove the coolant reservoir cap when the engine is running or hot.

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Fiesta(CCT)Canada/UnitedStatesofAmerica,HE8J 19A321AAenUSA,Editiondate:201607,FirstPrinting