How Fail-Safe Cooling Works - Ford 2015 EDGE Owner's Manual

Do not add extra inhibitors or additives to
the coolant. These can be harmful and
compromise the corrosion protection of
the engine coolant.
When adding coolant:
1. Unscrew the cap slowly. Pressure
escapes as you unscrew the cap.
2. Add prediluted engine coolant meeting
the Ford specification. See Capacities
and Specifications (page 321).
3. Check the coolant level in the coolant
reservoir the next few times you drive
your vehicle.
4. If necessary, add enough prediluted
engine coolant to bring the coolant
level to the proper level.
Recycled Engine Coolant
Ford Motor Company does not recommend
the use of recycled engine coolant since a
Ford-approved recycling process is not yet
available.
Used engine coolant should be disposed
of in an appropriate manner. Follow your
community's regulations and standards
for recycling and disposing of automotive
fluids.
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.
Edge/Galaxy/S-MAX (CDQ), enUSA, First Printing
Maintenance
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 freeze and corrosion
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 the engine coolant supply is depleted,
this feature allows the vehicle to be driven
temporarily before incremental component
damage is incurred. The fail-safe distance
depends on outside 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 and:
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.
265
A high engine temperature
message appears in the
information display.
The service engine soon
indicator appears in the
information display.