Operation

Operation  - Electronic climate control (ECC) - Climate - Volvo XC90 Owners Manual - Volvo XC90

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.

Keep in mind the following:
Х Make it a rule to have the air quality sensor activated at all times.
Х Recirculation is limited in cold climates to avoid fogging.
Х If window fogging occurs, you should deactivate the air quality sensor. Also use the defroster functions for the windshield, side windows and rear window.
Х 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.

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