I have a 1984 190D 2.2 with 138k+ miles on it. I have verrified it is low on R12 refridgerant and I would like to add some. I have 7, 12oz cans of R12 and the filling hoze. Through the viewing window I had a white foam appear and a few bubbles here and there once it ran for about 30 seconds. I don't want to use half a can and have to throw it away, you know since the stuff is very expensive and almost impossible to find today since it's illegal. Any thoughts and the procedure? Never recharged this car before... Thanks!

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1984 190D 2.2 Auto 220k
2001 Jeep Cherokee Sport 70K
2004 Lexus RX-330 ??K
2005 Chrylser Crossfire LTD 6K

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