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MaintenanceSevere ClimatesIf you drive in extremely cold climates:• It may be necessary to have a Fordauthorized dealer increase the coolantconcentration above 50%.• A coolant concentration of 60%provides improved freeze pointprotection. Engine coolantconcentrations above 60% decreasethe overheat protection characteristicsof the engine coolant and may causeengine damage.If you drive in extremely hot climates:• It may be necessary to have a Fordauthorized dealer decrease the coolantconcentration to 40%.• A coolant concentration of 40%provides improved overheat protection.Engine coolant concentrations below40% will decrease the corrosion orfreeze protection characteristics of theengine coolant and may cause enginedamage.Vehicles driven year-round in non-extremeclimates should use prediluted enginecoolant for optimum cooling system andengine protection.What You Should Know About Fail-Safe CoolingIf you deplete the engine coolant supply,fail-safe cooling allows you to temporarilydrive your vehicle before you incurincremental component damage. Thefail-safe distance depends on ambienttemperatures, vehicle load and terrain.How Fail-Safe Cooling WorksIf the engine begins to overheat, the enginecoolant temperature gauge will move tothe red (hot) area and:the coolant temperaturewarning light will illuminatethe service engine soon indicatorwill illuminate.If the engine reaches a presetover-temperature condition, the engineautomatically switches to alternatingcylinder operation. Each disabled cylinderacts as an air pump and cools the engine.When this occurs, your vehicle will stilloperate. However:• The engine power will be limited.• This will disable the air conditioningsystem.Continued operation increases the enginetemperature, causing the engine to shutdown completely. Your steering andbraking effort increases in this situation.Once the engine temperature cools, theengine can be re-started. Take your vehicleto an authorized dealer as soon as possibleto minimize engine damage.When Fail-Safe Mode Is ActivatedWARNINGSFail-safe mode is for use duringemergencies only. Operate yourvehicle in fail-safe mode only as longas necessary to bring your vehicle to restin a safe location and seek immediaterepairs. When in fail-safe mode, yourvehicle will have limited power, will not beable to maintain high-speed operation, andmay completely shut down withoutwarning, potentially losing engine power,power steering assist, and power brakeassist, which may increase the possibilityof a crash resulting in serious injury.Never remove the coolant reservoircap while the engine is running or hot.243F150 (TF6) , enUSA