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engine running, a/c on max....not a 134 conversion...still r-12.

Tried to put r-12 into my jeep last night. Hooked up the hose, punctured the can, loosened the valve....unit di not take any freon. Had to disconnect. What is the correct procedure and did I leave something out? Also....fan works sporatically AND blows only out the defroster vents. What causes...