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R12 or r134?

Should be R12. There'll be a sticker on top of the a/c compressor.

The 94 FSM does come with a supplement for R134, though. May be a mid year switch. Check the compressor to be sure.
 
quickest way is to look at the fittings(high and low side) R12 fittings look like a regular looking "tire" valve type, 134a has snap on type fittings...basically you can only put 134a gauges on a 134a system and the same for r12.
 
Yeah, you beat me to it. I just called a guy I know at my local Jeep dealer and he told me the same thing.
 
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