I’ve got a 2005 XC90 V8. For about 3 months now, at start up, there is an extremely loud sequel that last for 10-15 minutes if the car idles. If I immediately start driving it the noise is almost deafening. It last about 3 miles before it subsides to nothing. I’ve put water on the belt to ensure it’s not that, and the noise increases. So it’s not the belt. Any ideas?