Common fault with e9x made between certain dates (can't remember exactly but 2006 / 2007 I think) where the aluminium heat exchangers in the A/C corrode and blow out loads of Aluminium Oxide. Only solution is a new heat exchanger ££££
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Ian
Current: 2021 G21 330i M-Sport
Previous: 2018 A6 Avant S-Line MMI+, 2014 F31 320d M-Sport, 2013 F10 520d M-Sport, 2011 F10 530d M-Sport, 2008 320i M-Sport Coupe, 2002 325i, 2001 318i valvetronic, 1998 318i, 1996 525i, 1990 Porsche 944S2