You are probably trying to hook it to the high pressure side. 134a systems have different size fittings on the high and low sides as a safety feature. If you hook the fill can to the high pressure side, it can make the can blow up. 504, 94 should be 134, but anything is possible. Didn't the r12 systems have schrader valves instead of the quick connect fittings?
This post was edited by Wesley Stephens at 19:58:38 02/05/10.
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