Hello ALL,My 2006 E83 X3 appear to be losing air con gas over time. 2 months ago, took it to Naidu for gas refill, with another unscheduled visit yesterday for the same problem. Naidu has advised me that the cooling coil needs to be replaced. This involves removing the front dash which I am uncomfortable with. Before I go down the line of replacing the cooling coil, what other checks can I perform to Eliminate the possibility of leak in other parts of the cooling system.A review of the many BMW forums indicate that there is the possibility that leaks can happen through out the system. They talk about filling a coloured dye into the system, then using a torch light to seek out any leaks. The fluorescent nature of the dye will show up any leaks. Naidu did not carry out any specific test. Thus, has any other forum members carried out further checks before "blaming" the poor cooling coil.rgds