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There are retrofit kits available. I think all you do with them is remove the schrader valves from the ports that are on your existing AC lines, then screw on the new fittings which come in the retrofit kit. Then you’ll need to take it somewhere that does AC work and have the system evacuated and recharged. There should be installation directions with the kit. I don’t know how easy those kits are going to be to find though. They were very popular back in the day, but now most cars on the road are either new enough that they come from the factory with R134a, or were converted to it in the past. It’s a rare day to see something outside of a junkyard that still uses R12.
I’d also suggest replacing the reciever dryer and the expansion valve, in addition to flushing the entire system. The refrigerant oil that is used with R-12 isn’t compatible with the oil used with R-134a (PAG 46 I think is what is recommended for your Toyota), and it turns into a black, tarry mess that can really gum up your compressor. You can flush the system with mineral spirits if you’re looking to save a few dollars, or you can buy a can of A/C flush at the part store that’s already under pressure if you’re not up for buying a flush gun.
To flush the compressor, you’ll need to remove it. If I remember correctly, it will come out up top if you remove the power steering pump first and just push it out of the way, but leave the lines connected.. Once it’s out, turn it upside down and turn it until all the old oil comes out. I usually pour in some fresh oil just for good measure and run it through and then drain it just for good measure. Pop in a couple new seals and then re-install it.
The parts aren’t very expensive to replace when you consider the cost of a new or reman’d compressor. Good luck!
All of the suggestions above are spot on and great recommendations. I’m just going to add that at least in my experience at the Acura dealer the only thing that many of my contemporaries did was to replace the fittings, evacuate the system and fill with R134 and to be honest I didn’t see too many comebacks from them. I will also say that the fittings you install for the retrofit are a prime location for leaks so be sure they are installed correctly to help prevent that.
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