To change the cruising speed

See also:

Airflow selection
...

For U.S.A.
The following information has been compiled according to Code of Federal Regulations “Title 49, Part 575”. ...

If no steam is coming from the engine compartment
NOTE For details about how to check the coolant level or how to add coolant, refer to “Engine coolant” F11-17. 1. Keep the engine running at idling speed. 2. Open the hood to ventilate the engine ...