Does it whistle while running or with engine off? If it does it while running then the oil trap box has an internal vacuum leak. It should be posting fault codes for fuel trim problems if this is the case. If this is what you mean then call Volvo to see if the oil trap box is covered by the extended emmissions warranty. Should be covered for 10 years/150k miles. Also if it does whistle while idling, remove the oil cap or the dipstick. You will here a load suction noise and then the whistle will go away. Good luck to you and keep me posted please.
Saturday, August 20th, 2011 AT 5:53 PM