See also:

Blower control
Turn the control clockwise to increase or counterclockwise to decrease the blower speed. If AUTO is selected, blower speed will be regulated automatically and this will override manual adjustment. ...

Keypads
Keypads in the steering wheel 1 - Cruise control, see page 153. Adaptive cruise control*, see page 155. 2 - Infotainment controls, see page 207. ...

Deposit control gasoline (detergent additives)
Volvo recommends the use of detergent gasoline to control engine deposits. Detergent gasoline is effective in keeping injectors and intake valves clean. Consistent use of deposit control gasol ...