2014 Ford F150 SuperCrew Cab Owner Manual Printing 1 - Page 244

Maintenance What You Should Know About FailSafe Cooling If you deplete the engine coolant supply, this feature allows you to temporarily drive your vehicle before you incur incremental component damage. The "fail-safe" distance depends on ambient temperatures, vehicle load and terrain. How Fail-Safe Cooling Works If the engine begins to overheat, the engine coolant temperature gauge will move to the red (hot) area and: the coolant temperature warning light will illuminate the service engine soon indicator will illuminate. If the engine reaches a preset over-temperature condition, the engine will automatically switch to alternating cylinder operation. Each disabled cylinder acts as an air pump and cools the engine. When this occurs the vehicle will still operate. However: • the engine power will be limited • this will disable the air conditioning system. Continued operation will increase the engine temperature and the engine will completely shut down, causing steering and braking effort to increase. Once the engine temperature cools, the engine can be re-started. Take your vehicle to an authorized dealer as soon as possible to minimize engine damage. When Fail-Safe Mode Is Activated WARNINGS Fail-safe mode is for use during emergencies only. Operate the vehicle in fail-safe mode only as long as necessary to bring the vehicle to rest in a safe location and seek immediate repairs. When in fail-safe mode, the vehicle will have limited power, will not be able to maintain high-speed operation, 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 while the engine is running or hot. You have limited engine power when in the fail-safe mode, so drive the vehicle with caution. The vehicle will not be able to maintain high-speed operation and the engine will run rough. Remember that the engine is capable of completely shutting down automatically to prevent engine damage, therefore: 1. Pull off the road as soon as safely possible and turn off the engine. 2. Have your vehicle towed to an authorized dealer 3. If this is not possible, wait a short period for the engine to cool. 4. Check the coolant level and replenish if low. 5. Re-start the engine and take your vehicle to an authorized dealer. Note: Driving the vehicle without repairing the engine problem increases the chance of engine damage. Take your vehicle to an authorized dealer as soon as possible. 242 F150 (TF6)