Already told you

behind the side panel behind the drivers seat, look on that FAQ link, all the schematics are there.
This thread may help, pics on page 4 of me removing rear system -
http://www.igmaynard.co.uk/bongo/forum/ ... 0&start=45
Bear in mind access is very limited in the well it sits in, the clips that hold the 2 halves of the casing are all but impossible to find/replace if you take them off in situ, they ping off nicely

. To take out the whole unit you have to disconnect the ac pipework & lose all the gas as well as the coolant pipes, not a 5 minute job. The fan can be removed relatively easily once the panel is off though, there is a bolt under the sill outside.
You can't polish a turd - but you can roll it in glitter.