Volvo S70 Owner's Manual page 62

1999 S70 & V70
Open the vents. The A/C system should be ON.
Adjust the temperature with the temperature selectors to raise the temperature if necessary.
The recirculation function should not be used for more than 15 minutes.
To demist/defrost the windows:
Set the function selector to
recirculation is not on. When the windows have cleared, set the blower control to the second position
and the function selector to the desired position. Always keep the air intake grille at the base of the
windshield under the rear edge of the hood free of snow.
Additional information
The air conditioning system will function best if it is always left on.
Water under the vehicle in hot weather can be the result of condensation from the air conditioning
system and is quite normal.
The air conditioning system functions only at temperatures above 32° F (0° C).
Use the RECIRCULATION function if the outside air is contaminated with exhaust gases, smoke, etc
or to heat/cool the car quickly. In this position, very little air is drawn into the passenger compartment
from the outside. Do not leave the system in this mode for more than 10-15 minutes since the air inside
the car will become stale. The temperature can be controlled with the temperature selectors.
If the panel vents are open, a certain amount of air will always flow through, regardless of the position
the function selector is in. To increase the flow of air to either the floor or the windows, close the panel
vents and open the outer vents .
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and the blower control to the highest position. The A/C will be ON if