Fluttering Heater/ac fan

[T4XI]

Hi all new member here , Unfortunatly I have been drawn to this forum by a problem with my T reg (98/99?) A4 Avant 1.9TDI . The heater motor is fluttering as if something has become trapped inside the fan, I see from the search that the motor is easily accessed but how easy it to access the actual impellor ? if I can even get to it at all?


thanks for any help you guys may be able to offer.