I was told to stay away from those "conversion kits" that just change out the refrigerant from R12 to R134, apparently to use R134 you need a much stronger compressor. My father used one of those conversion kits on his Bronco and it didnt cool at all so he had it switched back to R12.

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Adam,
2003 Volkswagen Golf GL 24,000 miles. 1.9L I-4 TDI 5spd.

1986 300E. 115,000+ miles. 3.0L I-6 1st daily ride, around town only. (Gone)