pull a vaccum for an hour and make sure it holds. i dont know anyone here who will still work on r12. they either try to convert or use freeze 12. i chose neither so i rented a vacuum at autozone and bought gauges and hoses at a pawn shop.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual