Just to put my 2 cents in. The RA23 LT aircon has a compressor mounted on the front right of the engine running off the same belt as the water pump. There is a second radiator (for the aircon) mounted just below and infront of the main engine radiator and the pipe work feeds through the normal vents in the interior. I belive that it was quite rare. When it works it is fantastic but I have a problem with mine in that the gases seem to escape form the compressior over a period of time. got to get it looked at again.!!!!!