I've got the 'lots of water in the passenger footwell problem'. So I've read around and wanted to check the A/C drains because that matches the problem well. I've been under the truck twice and looked around the transmission and bell housings, but can't find the A/C drain nipples. Anyone got a picture? Or some pointed instructions.

sorry, did try to find'em myself twice, but no luck.. must be going crazy.

 

Don't worry. Found it..

For others, it is right high up against the underside. If you've got some mud up there, it difficult to see, so clean off the underside high up behind the bell housing first!

 

like most thing on discos, hard to find and frustratingly hard to get to (well the drains are not too bad to get to).

 

If you can't find them try leaving the car running fore a few minutes when stationary with the AC on and then when you shut her off and get underneath you should be able to see water dripping from them.
The passenger one is easy the get to but the drivers side is a bit of a pain due to the exhaust so I used a coat hanger bent into the appropriate shape which seemed to work a treat.