Severe Climates
If you drive in extremely cold climates:
• It may be necessary to have an authorized dealer increase the coolant
concentration above 50%.
• A coolant concentration of 60% provides improved freeze point
protection. Engine coolant concentrations above 60% decrease the
overheat protection characteristics of the engine coolant and may
cause engine damage.
If you drive in extremely hot climates:
• It may be necessary to have an authorized dealer decrease the
coolant concentration to 40%.
• A coolant concentration of 40% provides improved overheat
protection. Engine coolant concentrations below 40% decrease the
corrosion and freeze protection characteristics of the engine coolant
and may cause engine damage.
Vehicles driven year-round in non-extreme climates should use
prediluted engine coolant for optimum cooling system and engine
protection.
What You Should Know About Fail-Safe Cooling (If Equipped)
(Gasoline Engine Only)
WARNING: If fail-safe cooling activates, pull off the road as soon
as safely possible and turn the engine off. The engine may
automatically shut off while driving without further indication.
If the engine coolant supply is very low, this feature allows you to drive
your vehicle temporarily before incremental component damage occurs.
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 moves to the red (hot) area.
• The information display indicates the engine is overheating.
• The service engine soon indicator illuminates.
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.
214 Maintenance
2015 F-650/750 (f67)
Owners Guide gf (ownloose), 1st Printing, December 2013
Canadian_French (fr_can)
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