Just had to do the same thing on my 54-plate Altea, which has Climatronic (so no series resistor). Elsawin is a lot less
help than usual in this area, as it describes the process for a LHD vehicle, with the whole dashboard and everything behind it reversed left-to-right. This includes the heater fan motor assembly, which you have to turn clockwise to remove, not anticlockwise. It was a lot easier after that...
Also, it recommends that you take the glove box out. You don't have to, and I don't think it would
help very much if you did. I couldn't find out
how to get to the screws at the bottom of the glove box, so I'm glad it wasn't necessary.
Once it's out, you find the fan motor is encased in a plastic moulding, and you can't get to the bottom, or at least I couldn't find out
how to release the motor without breaking anything. I contented myself with oiling the top bearing, spinning the fan, then adding a drop more oil, spinning again - repeat for as long as you can stand it. I used "3-in-One Professional High Performance Lubricant with PTFE" which I have found to penetrate well into dry hinges and bearings.
I would recommend against using WD-40 or any other penetrating oil. WD-40 was originally used to displace water from electrics, and was also found to be good at releasing corroded fasteners. The fan bearing isn't corroded, and (at least in my case) wasn't even stuck, just stiff. WD-40 gradually loses its lubricating properties and becomes a sticky mess, and is likely to cause the
problem all over again.
I'm annoyed that I couldn't get to the bottom bearing, or to look at the brushes, if indeed there are any brushes. Has anyone ever got the motor out of the casing?