E90 320D Blower fan

[Justintime]

Basically, noticed my 320Ds blower fan is running a bit like a propeller plane when turned up high.. fairly noisy and annoying. Not sure if i just noticed this or maybe its temperature related.. blows air fine just sounds like a lamborghini engine at idle Is this an expensive dash out job? If not it is it difficult?

 

[Justintime]

Hey, its a 'rumble', like an unbalanced dryer if you get me. The higher you turn the speed up it sounds like an airplane about to take off.