Remove the steering column shaft (1) (this step not needed on RHD models and some say not essential on LHD models)
To get to the blower (RHD cars). Take out the glove box; 4 screws top, 3 at the bottom (not 4) and 2 x 10mm bolts in the tray. Unclip the light.
Release the wiring harnesses.
Unlock and disconnect the connector (4). The blower has the connector (4) located at the top. Unclip (red and black wires) and pull out.
Unclip the locking tab (5) by pushing it at (A). The locating tab (5) may break away - you can secure it with a screw in (6) when re-installed.
Rotate the blower (as B)
Detach the heater blower (7) by rotating anticlockwise and withdrawing it downwards at (C) - takes some force.
You can now fit a new fan (two shown in picture; one in car!) - or dismantle and clean the motor - unstick or replace brushes and oil the bearings.
Note: If tab (5) is broken, fix motor at (6) using a bolt
Proceed in the reverse order to removal.
Check the operation.