See also:

Air distribution
The incoming air is distributed from a number of different vents in the passenger compartment. Air distribution is fully automatic in AUTO mode. If desired, air distribution can be controlled ...

Power brakes function only when the engine is running
The power brakes utilize vacuum pressure which is only created when the engine is running. Never let the vehicle roll to a stop with the engine switched off. If the power brakes are not working, ...

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. ...