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There is a very good chance your ac system was originally charged with R12 freon. If it was, someone will need to convert it to R134. That may require changing the receiver drier and some gaskets along with the adapter fittings for freon gauges.
This car originally contained R12, if you can find it you can use it. The other option if this has not already happened is you can convert the system from R12 to R134a, which is readily available, all auto part stores carry these kits. R12 AC fitting are threaded and R134a systems have slip on quick connect fittings.
Unless the labels are missing from the car, it will state which type of refrigerant is used. Could be either R12 or R134a. If originally R12, it could have been replaced by R134a with an upgrade kit. The easiest way to tell if the labels are missing, is to look at the valves on the AC system. If they are Schrader valves (same as used on tires), then it is the older R12. If the caps are Red (high pressure side) and blue (low pressure side), then it is R134a. The sale of R12 to non-certified mechanics is illegal in all states as far as I am aware. R134a is available in most states and retro-fit kits are available in most states.
I have done the retro-fit on 2 vehicles with acceptable results. It is recommended to remove all the old R12 with a vacuum pump. Autozone (in my area anyway) rents these.
Good luck if you need and decide to retro-fit yourself.
unfortunately there is no kit that has been made up, as it was not going to be cost-effective to make them up. What is required to replace is the receiver/drier assembly, the compressor will have to be drained of the oil in it, and then new oil and R134a gas put in.........it normally has to be done by a licensed air-conditioning installer.
How can you have a R134a Compressor that is 32 years old. That gas was not even available then. What you are asking is impossible, unless you are asking can you change from possibly R12 to R143a. The answer is yes but it would probably be too costly. you see R12 ran with mineral oil whereas R134a runs with Polyolester oil. the system would have to be completely flushed out of old oil, and the expansion device ( capilliary tube ), would have to be changed and cut to the correct length to appropriate the correct displacement of gas.
The R12 spec on the Saturn Threw 93, capacity R-12 2.1 to 2.25 lbs.
On the 94 -98 S-series cars; per
the Haynes A/C manual these systems should take 6.5 oz of Ester oil and
24 oz of r134a refrigerant.
The amount of refrigerant
required is printed on a label in the engine area. I think its 1.5lbs or
24ozs or two 12oz (net wgt) cans if your system is the R134a.
Thank you for using fixya and just make sure that your have the right system in your Saturn, it's going to be R12 from 1993 and earlier and 1994 will be R134a. Note: at if your not the original owner, your system may have been converted to the R134a.
Regardless the bad switch needs to be replaced. Your mostly going to loose some R134a and you may need to have the system serviced, but replacing the switch your self can be done like changing a spark plug. Just make sure your fast so you don't loose that much R134a and keep your cost of the repair to a minimum. Good luck and hope this helps.
There should be a lable underhood.but probably had R-12,Best to go ahead and convert to R134A.Recommend replace reciever drier ,buy conversion fittings from parts house for 134A,remove compressor turn upside down and rotate clutch by hand to get as much oil out as you can,then pour in aprox 4 oz pag oil.Reinstall,change orfice tube the will need aprox 12 oz R134A to replace 16oz R-12.Buy R134A at walmart cheaper than all parts houses by at least $2.00 a can.Cgarge till low side preasure at aprox 40 to 45 psi and gigh side 200 to 250 psi.Should cool fine.