Read this article. http://members.tripod.com/~jbabs714/autoac.htm Originally r-12. Fat chance of getting it anymore. Retrofit it to take R-134a.
R134a
R-134a
134a
The factory coolant is Dexcool. I used the Prestone universal, works with all models type. Seems to be fine.
It originally used dex-cool from the factory.
The factory coolant is a red, five year, HOAT type coolant.
regular "green" coolant
Dex cool coolant.
I would flush the cooling system with the heater on, thermistat removed, then rinse and put regular green coolant in it.
The universal coolant is a good way to go if you are not sure which it takes. The 98 Saturn has a big colored dot on the reservoir, green or orange Here's my opinion. They make a universal coolant now, perhaps Prestone or some other brand. It claims it can be mixed with ANY type of coolant... if you're not sure what it takes, go with that. Take your time flushing your coolant if it looks like mud. You may have to flush it multiple times to get all the junk out. I bought my Saturn used. When I checked all the fluids my coolant was a browish color. I ask my mechanic he told me that who had it before put both green and orange coolant in it. He flushed it and put in orange coolant.
Your 1993 Toyota AC: is fuel by Freon. Freon and a recharge kit can be obtained from most auto-parts stores.
The Mopar coolant is red, five year, hoat type. Zerex sells it as GO5.