To remove mirror glass you'll need a flat head screwdriver.

Push the base of the mirror down at the point 'X' in the pic
IMG00133-20091102-1124edited.jpg
Then place the Flat head screwdriver behind the mirror glass as the top around the area that the arrow points to in the pic.

Now push the screwdriver away from you to level the mirror glass towards you. (NB, I've not yet managed to brake any mirror glass doing this yet, but it could be possible, so do not proceed if you don't want to take this risk/don't have a replacement).

The glass should then unclip and fall forwards.

The Heater Element & Wiring



Now that your glass has been removed from the door mirror unit you should be greeted by the following.

IMG00128-20091102-1123.jpg

The two wires attached to the mirror glass are for the heater elements. Carefully remove these. Your mirror glass should now be compleatly detached from the mirror housing.

You can now clean electrical contacts on glass to try and repair the none functioning heater, or replace with a new one.

Re-attaching the mirror is the opposite of removing. Re-attach heater wiring, and then place clip on the back of the glass over the motor housing in the mirror housing and push into place. Then re-possition mirror into its correct driving possition, and hey presto. Job done (y)

Here are some reference pic's of old vs new glass units.
IMG00136-20091106-1448.jpg
IMG00137-20091106-1448.jpg
IMG00135-20091106-1448.jpg

The new one works alot better at heating up than the origional but still working unit on the other side of the car. It is my belief that the heater units slowly brakedown before they stop working compleatly, so I'm planning on getting another unit to replace the slightly less effective side.

I hope this guide has been useful (y)

Jon.