Volvo 2006 S60 Manual page 44

When the ECC system is in the AUTO mode, the green LED will be on
Operation
Press to operate the air quality sensor (normal setting).
Or:
Select one of the following three functions by pressing
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:
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.
If fogging occurs, use the defroster functions for the windshield, side windows and rear window. See
The filter should be changed at the intervals recommended in the service schedule. However, if the car is used in a
severely contaminated environment, it may be necessary to change the filter more frequently.
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