Good evening – since Monday during the ride – I do not have in the stand (empty run) a , the engine noise overlaying , constant sound . The sound is heard in the front part of the vehicle . The sound can be compared to as if one blows in an empty bottle (above on the bottle neck , like flute playing … , or in the distance a fog horn ( from the lighthouse ) . The sound is heard at different speeds . It does not change at speed . The sound never changes at the pitch . The sound sets in about after about 5 km of driving distance . Climate off or on : no change . Volvo service : at ease . I realize that an answer without having heard the sound itself is not easy . But I would at least have tried . Thanks ! XC 70 AWD (MJ 16 ) , D5 , Polestar , Automatic 40 Tkm