How to confirm bad turbo?

[MarkM]

I believe my car exhibits the symptoms of a bad turbo...in very cold weather, the turbo makes all kinds of noises. I think the turbo is performing, and I believe the boost is probably ok (engine not sluggish), but bearings are probably bad. When weather is very cold, bearings probably have more play (?), thus explaining more noises when cold. These symptoms dont appear in summer weather, so i'm not sure if I need to get a replacement cartridge for the turbo.

To verify bad turbo bearings, do I just take off the intake duct and feel for shaft play? (obviously when engine is cold and not running!!!!)

Thanks,

Mark