Extremely loud squeal at startup

[Stiebertw]

I’ve got a 2005 XC90 V8. For about 3 months now, at start up, there is an extremely loud squeal that lasts for about 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’d say it increases on 90 degree turns. If I punch the gas and increase speed quickly the noise goes away faster. 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?

[RickHaleParker]

Take a length of rubber hose. Stick one end in your ear. Use the other end to locate where the squealer is hiding.

[ggleavitt]

2005 V8- how many miles on the vehicle and when was the aux belt and the idlers replaced (with or without a new tensioner)?

Power steering pump and fluid is original? Reservoir level is correct? PS fluid ever changed/added and if yes, what fluid was used?