Hey guys, thanks for the feedback. Sixto, the squeal does not sound turn related. Sometimes it is quiet, other times it is fairly constantly making a variety of low-volume high-pitched squeaks on Low that are drowned out if running on Max or Auto. Chris, I'll try aiming the vent up to see if that gives me some mid range, Thanks. Sixto, did you ever get that W140 mod? And would you guys think that a turn-influenced squeak would indicate a possibly loose blower center clamp that is allowing the cage(s) to rub (contact the housing) as a result of the spinning gyro-torque "resisting" the turn? Mine is not doing that. And it spun freely and smoothly when I replaced it. Maybe I'll just turn up the radio...