See also:

Blower control
Turn the control clockwise to increase or counterclockwise to decrease the blower speed. If AUTO is selected, blower speed will be regulated automatically and this will override manual adjustment. ...

Resetting
If the battery has been disconnected, the auto open function must be reset so that it will work properly. 1. Gently raise the front section of the button to close the window and hold it for one s ...

Accessory installation
• We strongly recommend that Volvo owners install only genuine, Volvo-approved accessories, and that accessory installations be performed only by a trained and qualified Volvo service technician. ...