2010 Volvo XC90 Owner's Manual - Page 97

03 Climate Electronic climate control (ECC) Operation Press to operate the air quality sensor (normal setting). or: Select one of the following three functions by pressing 1, 2 or 3 times. 1. The AUT LED lights. The air quality sensor is now activated. 2. No LED lights. Recirculation is not activated unless needed to cool the passenger compartment in a warm climate. 3. The MAN LED lights. Recirculation is now activated. 03 Keep in mind the following: • Make it a rule to have the air quality sensor activated at all times. • Recirculation is limited in cold climates to avoid fogging. • If window fogging occurs, you should deactivate the air quality sensor. Also use the defroster functions for the windshield, side windows and rear window, see page 94. • The filter should be changed at the intervals recommended in the service schedule. However, if the vehicle is used in a severely contaminated environment, it may be necessary to change the filter more frequently. 97