I have a problem with the air conditioning on my car in so far as there is a small leak to the high pressure liquid line to the evaporator. The pipe is of course aluminium and the leak is in an area of the engine bay that is difficult to access. It would be even harder to replace the pipe as one clamp has very cleverly been secured from below before the engine and its crossmember were fitted, thus seemingly making it an engine-out job! As I can access the ends, albeit with difficulty, what are the chances I could replace the middle section with copper using either flare joints or compression joints? Would I be likely to get leaks, is the aluminium too soft or might I get corrosion over time? Your thoughts / experiences would be gratefully received.

David