Yesterday my coupe turbo let me down. I parked up and spotted a trail of water leading to the front of my car, not the air con as it was switched off.
It turns out that the water pipe that goes to the top heater matrix pipe had been rubbing on the gear linkage and wore through. It appears that it should have a clip to holding it in place with the other pipes, but it was no where to be seen.
Check your car to make sure the same does not happen to you as none of our main delaers had one in stock!