i had this problem, as soon as the a/c was on a noise like the engine was about to explode happened lol,
got my friends dad to come have a look, he gave me a number for an air con guy, came out to me n turns out my
compressor (barings to be exact, no lube, therefore loud noise like metal crunching when it was turned on) had shit its self due to a number of reasons. so had to get a new one put in, along with some bs valve n a regas