Thanks David and Frank,
The air conditioner on the car has not been running for over 10 years but all the hardware is their.
I checked out the plenum chamber it looks good, no rust, no debris and water flows out the 2 ducbkbill holes. One side does not have a duckbill and the other side does but it is dried up and busted up at the end. Is it worth getting new ones or is it one of things where it’s better without them?
What are the holes with a hinged flap at each end of the plenum chamber ? Are they air vents, and normally open?
I found the 2 drain pipes around the transmission, where does the other end of these pipes go to?
The car is going on the hoist in a weeks time to have a diff changeover, I will be able to have a good go at cleaning it then or can you get to it from the other end of the tubes?