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Hmmm........I'm going to take the position of.....seeing as you're asking what to do then you have no experience servicing an A/C system. Don't feel as tho you're being flamed because many do not know what to do The first things you will need are tools 1. set of A/C manifold gauges 2. vacuum pump there's no getting around these items....they are mandatory 3. flush kit since you have a 93 the a/c system was/is R12 when *converting* and I use that term loosely to 134a there are procedures that need to be done. 134a does not mix with mineral oil, all R12 systems made use of mineral oil, 134a makes use of Pag or Ester oil or an equivalent. Since 134a doesn't like to play with mineral all of the mineral oil has to be flushed from the system. Has this been done yet? If not do so..... you'll need a flush kit..... also when doing this procedure the a/c receiver/dryer will need to be replaced & the orifice tube should be replaced as well. One does NOT flush the compressor, it comes off the engine & is drained separately, the amount of oil in the housing is drained into a measured beaker and the same amount of Pag/Ester is poured back into the compressor. Seeing as the system has now come apart new O-rings are needed to seal the system up again. Are you disillusioned yet? A set of R12 manifold gauges can be had for a relatively inexpensive price.....get the R12 set & then purchase the 2 134a quick disconnect fittings that will screw onto the ends of the hoses. A vacuum pump will run you near $120us for a decent 1/3hp 5cfm 2 stage pump. Now, there is another way of doing all of this without *converting* to 134a.........purchase an R12 substitute, if the system oil is still mineral then you have that option of going in this route. Food for thought........

All buttoned up. Just need to finish the install. Had a back injury for a setback, but much better now so it goes in soon.