Air con drain hose location on P38

I'm having problems locating and unblocking my Air Con drain hoses.
 
I know they exit under the car somewhere but I just can't find them.
 
Can anyone help as I'm slowy drowning in the flow of water that is entering the passenger side of my cabin?

Take a flash light, crawl under the truckjust in front of the tranny. If you shine a light on the floor board above the trany and on either side you should see 2 rubber nipples, one on either side of the trannt. carefully squeeze the nipples, if that doesn't work run a small wire up inside the tube.
Mike