Heater Blower removal

Is there a guide or something on this?
I need to open it as it sounds like something knocking in there when its on full blast!

Any help much appreciated!
 
If you look under the dashboard. Passenger side.. there's a big plastic tube... pop that out the way and you have access to the fan.. if the fan is loose it will knock.
The fact it doesn't do it at lower speed suggests there is nothing in it
 
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