It sounds like the oil trap box is leaking. To verify it is the box, with the car running, pull the oil dip stick out. You will hear a load suction noise and the howling will go away. If it does, take it in to Volvo to have it replaced.
The box and PCV hose should be covered under the
10year/150k mile emmisions warranty. While doing that, also have them update the ECM software as well after the repairs if one is available. That should also be covered by a 10year/150k mile extended warranty. If you have more questions, let me know. Also if you have had this repair done already and paid a shop to do it, you could submit your repair order and reciept of payment to get reimbursed for the repair.
Sunday, October 17th, 2010 AT 4:32 PM