2018 Fusion Owner's Manual

Maintenance

If you drive in extremely hot climates: • It may be necessary to decrease the coolant concentration to 40%. • A coolant concentration of 40% provides improved overheat protection. 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. 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:

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. Your vehicle has limited engine power when in the fail-safe mode, drive your vehicle with caution. Your vehicle does not maintain high-speed operation and the engine may operate poorly. Remember that the engine is capable of automatically shutting down to prevent engine damage. In this situation: 1. Pull off the road as soon as safely possible and switch the engine off. 2. If you are a member of a roadside assistance program, we recommend that you contact your roadside assistance service provider. 3. If this is not possible, wait a short period for the engine to cool.

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.

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