Blowing hot air through the side vents especially summertime is not nice. Even with the air-conditioner working on full cold 🙂 .  Pair of Bosch motors in a little  group called the DuoValve, i guess they never thought it will wear. So just build the piece to non recyclable/re-workable. Bad, very bad. These are some pics after dissection,

and if this isn’t bad enough look at the top of the motor,

this was not well built at all! But again, after i have replaced it with a second hand unit, running as it should.