The cabin blower fan in my 997 has got very noisy of late; not too bad a low speed but as the speed increases the noise gets worse until it sounds as if the fan blades are knocking on something. Any one know how to access this fan, or any ideas of what may be causing excessive noise all vents seem to be blowing ok.
Any suggestions of things to try would be much appreciated
Any suggestions of things to try would be much appreciated