I’ve been potching with these different VcU fans I have for past week. Plastic fan rotation direction is different, but can be swapped around. Just thought I’d pass the idea on to you.
Is yours roaring because the fans are opposed to the air flow (plastic is fitted backwards) check my pic and see if they point same way?
You want his phone number? he is in west drayton... he specialises in BMW engines, and he doesn't ask you to leave it there for a week, he will do it the same day