Ford 1997 Aerostar Manual page 21

If your engine overheats:
1. Pull off the road as soon as it is safely
possible.
2. Turn off the engine.
3. Let the engine cool. DO NOT REMOVE
COOLANT SYSTEM FILL CAP UNTIL
THE ENGINE IS COOL.
4. Check the coolant level following the
instructions on checking and adding coolant
to your engine. Refer to Engine coolant in the
Index. If you do not follow these
instructions, you or others could be injured.
Engine coolant temperature gauge
Speedometer
The speedometer tells you how many miles
(kilometers) per hour your vehicle is moving.
Your vehicle contains a speedometer which
receives its input from the Anti-Lock brake
sensor. The speedometer is also used to provide
a speed signal for correct operation of the
vehicle's Powertrain Control Module (PCM),
electronic transmission, and speed control (if so
equipped). Because of this, it is very
IMPORTANT to change the speedometer's
internal conversion constant if the size of the
tires on the vehicle is changed. Changing the
conversion constant to the proper value when
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