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How Fail-Safe Cooling Works
If the engine begins to overheat, the engine
coolant temperature gauge will move to the
red (hot) area and:
A high engine temperature
message will appear in the
information display.
The service engine soon indicator
will light.
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.
• The air conditioning system will be
disabled.
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 your
vehicle in fail-safe mode only as long as
necessary to bring your 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 your vehicle with
caution. Your 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 switch the engine off.
2. Arrange for your vehicle to be taken 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 your vehicle without repairing
the engine problem increases the chance of
engine damage. Take your vehicle to an
authorized dealer as soon as possible.
294
MKC (TME) Canada/United States of America, enUSA, Edition date: 201802, First Printing
Maintenance
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