Which valve do you put freon in on a 1995 Chevy 1500?

low port is on the dryer, the fittings should be different enough so that you dont hook up to wrong one, but high side (the one you dont want to hook up to) is always between the compressor and condenser(radiator like thing)
 
the connector on the freon can will only fit one fitting, unless your system is R12, but you can't buy R12 anymore so if your trying to put R134 in aR12 system don't do it unless you know what your doing because you can damage your compressor if it's not done right.
 
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