discovery aircon

hi i have a 2001 td5 auto, a while ago i was driving along and switched the air con on.when a cloud of water/spray came out of the face level air vents not a little quite allot . could it be the drain tube from the air con blocked .if so any one know exactly where it is?

On a 300tdi this comes out in the transmission tunnel adjacent the gearbox. I would assume the 200 would be similar. By the sounds of it the water has probably come in via the air vents in front of the windscreen because the drain on them is blocked. These are normally on the bulkhead in the engine bay, but may well be under the front wings.