The original Bosch R12 A/C slowly leaks as seals dry out when unused; converting to R134a (e.g. with an A/C Solutions bracket) is a common fix owners plan for.
R12 A/C leaks and R134a conversion
BMW E30 M3 (1986-1991) · mechanical
The original Bosch R12 A/C slowly leaks as seals dry out when unused; converting to R134a (e.g. with an A/C Solutions bracket) is a common fix owners plan for.