After replacing power steering rack i noticed a whooshing or new sound coming from the the drivers side vent when accelerating. does not do it when in neutral revving in up. I took it in to local volvo mechanic and had it smoke tested and the turbo checked. All good. They said it could be PCV system. I just redid all of the pcv system with no change in the sound although that needed to be done. Any help on this.