Volvo VNL 780 Operator's Manual page 130

120 INSTRUMENTS AND CONTROLS
Recirculation
Press recirculation to circulate the air in the cab. Only a small amount of air is taken directly
from outside.
The light in the button comes on when the button is pressed for air recirculation.
Temperature Control Settings MCC
Move the knob to the blue bar for cool air to circulate in the cab, and to the red bar for
warm to hot air to circulate in the cab. Select the desired fan speed starting from 1 to 4. "0"
is not a fan speed.
Mist and Ice Removal
DANGER
DO NOT attempt to drive with the
windshield covered by mist, or fog or
frost. The visibility is reduced, which
could lead to an accident causing severe
personal injury or death.
1 Turn knob to defrost.
2 Rotate the temperature knob to add heat as necessary.
3 Set the fan to maximum (the extreme right).
Use these instructions to keep the windshield clear at all times. Maximum heat output for
fast defrosting can only happen after the engine has reached operating temperature.
While driving in extreme cold, adding heat to the windshield may change drifting snow to
ice, in this case, setting the air distribution to floor and/or panel only may allow the drifting
snow to be brushed off by the windshield wiper.
Clean the inside of the window using normal window cleaner in order to minimize the risk
of misting. Clean more often if a passenger smokes in the cab.