Ford 2002 Crown Victoria Manual page 204

Maintenance and Specifications
Vehicles driven year-round in non-extreme climates should use a 50/50
mixture of engine coolant and distilled water 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 ambient temperatures, vehicle load
and terrain.
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.
204
H
TEMP
C
H
N
O
R
M
C