Well after trauling the internet looking for a fix for my blower not working i stumbled across this site, so armed with common faults i started.
Now my fault was no blower on 1234 so this might not help some of you.
remove driver scuttle panel
unbolt firewall 10ish 10mm bolts
unplug fan connector and check voltage with ignition on and fan switch at 4
If you have 12volts then this is the cheap fix for you.
Remove blower unit (3 10mm bolts) and multiplug (slide red part out) and unclip the plastic clips making sure not to snap them (i broke 2 lol)
Now the unit is in 2 halfs grab the fan part and wiggle the motor unit out.
Pop the metal clips off sides to get to the brushes (2 clips & 2 springs)
If like me you will the wires and brushes destroyed.
or google for siemens motor brushes and purchase (£12.50 for a pair)
now these will be to big but the graphite is soft as butter so these can be filed down so they slide in witout binding. (might also need to be shortened to around 15mm in length) I used some from a mk1 golf unit so size might vary.
you now need to trim the original wires to 10mm ish in length, also do the same on the new brushes.
Solder the 2 wires together and reassemble.
Plug back up and hey presto working blower.
saving of £195 from dealers for a hours work.
Hope this is of use to someone?