See also:

Heated rear seats
Heat control for the outboard seating positions is done in the same way as for the front seats. ...

ABS (Anti-lock brake system)
If the warning light comes on, there is a malfunction of the ABS system (the standard braking system will still function). The vehicle should be driven to a trained and qualified Volvo service ...

Check coolant level
The cooling system must be filled with coolant and not leak to operate at maximum efficiency. Check the coolant level regularly. The level should be between the MAX and MIN marks on the expansio ...