See also:

Headlights
Headlights To turn on the headlights, turn the knob on the end of the turn signal lever. first position Instrument panel illumination, tail lights, front side marker lights and license ...

If steam is coming from the engine compartment
Turn off the engine and get everyone away from the vehicle until it cools down. ...

Brake booster
The brake booster uses engine manifold vacuum to assist braking force. Do not turn off the engine while driving because that will turn off the brake booster, resulting in poor braking power. ...