SKODASGOOD

Had an intermittent buzzing/low growling from the car in hot weather recently and the aircon wasn't blowing very cold. Dreading a leak and the pump being on its way out and £££££s, the car went straight to my local brilliant garage, they only did the yearly aircon gas in May. It was done within the hour only 50milligrams of gas added, but the cause of the noise was a blocked drain/breather pipe with some dried mud. The engineer explained roughly where the pipe was,but it needed to be on a ramp to see it. The car goes off road on mud and grass regularly and so if it happens again I would like to know exactly where the pipe is please? Does anyone know where the aircon drain pipe is under the car? Thanks