Volvo XC90 Owner's Manual page 217

Air distribution
Main airflow from defroster and dashboard vents. Some airflow
from other vents.
Main airflow from defroster and floor vents. Some airflow from
other vents.
Main airflow from dashboard and floor vents. Some airflow from
other vents.
Main airflow from defroster, dashboard and floor vents.
Purpose
Provides a comfortable climate in warm and dry weather.
Provides a comfortable climate and effective defogging in cold and
humid weather.
Provides a comfortable climate in sunny, cool weather.
Provides balanced comfort in the passenger compartment.
CLIMATE CONTROL
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