How Fail-Safe Cooling Works; If The Engine Begins To Overheat - Mercury 2000 Grand Marquis Owner's Manual

Maintenance and care

How fail-safe cooling works

Standard cluster
Optional cluster

If the engine begins to overheat:

the engine coolant temperature gauge will move to the H (hot) area
(if your vehicle is equipped with analog gauges).
the engine coolant temperature gauge will illuminate all eight bars and
a tone will sound every five seconds for one minute (if your vehicle is
equipped with digital gauges).
the symbol will illuminate.
the Check Engine indicator light 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.
the air conditioning system will be disabled.
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