2010 Max and I just noticed around 25mph a strange humming type sound coming from what seems to be the rear pass side. Almost exactly like if you had one window cracked open. I'm sure we've all heard that annoying sound! All the windows are shut tight and I can't figure out what the hell it is. Any ideas?

 

Could be a wheel bearing.

 

Sounds like the wheel bearing. If it is, the sound will get worse over time and will usually increase with speed. It's covered under the powertrain warranty if you're still within the coverage 5yrs/60kmiles. If not its around $300 or so at the dealer.