Ford Mercury Villager 1997 Owner's Manual page 23

Under any circumstances, if the pointer moves past the upper
limit of the NORMAL band, the engine is overheating and engine
damage may occur.
If your engine overheats:
1. Pull off the road as soon as it is safely possible.
2. Turn off the engine. If you do not stop the engine as soon as
safely possible, severe engine damage could result.
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, see Engine coolant in the
Index. If you do not follow these instructions, you or others
could be injured.
5. Refer to Adding Engine Coolant in the Maintenance and Care
chapter. Add as much coolant as your engine needs. If the engine
continues to overheat, have the cooling system serviced.
Engine coolant temperature gauge
Speedometer
The speedometer tells you how many miles (kilometers) per hour
your vehicle is moving.
Instrumentation
19