I have an 02 Galaxy 1.9TDi with Air Conditioning problems - my AC Repair man suspects that as he cannot find a significant leak but it keeps losing gas in the space of 4-6 days that the evaporator is leaking. He has given me two options - replace the evaporator which is a big job involving removing the dash board or use a "rad weld" system espaecially for AC units - has anyone any thoughts on teh options, any success with stopping leaks in AC systems, has anyone had an evaporator fail?