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To recharge your AC you have to get the bottles of refrigerant and a nozzle that screws onto them. Attach the nozzle to the low side port of the AC (should be the one with the blue cap) and pour the refrigerant in. A couple of problems that you may run into include the fact that any prelude made in 1992 or earlier uses the older R12 refrigerant instead of the new R134a. Unless somebody has retrofitted your AC, you are still using the R12 which is very expensive and illegal for you to charge yourself unless you are certified. You can either buy a retrofit kit or let a professional retrofit the system to R134a. The other problem you may run into charging it yourself is that if you put in too much refrigerant you will burn up your AC compressor. I would recommend letting a pro do this, a complete retrofit is usually about $150 to $200 and very worthwhile, after it's retrofitted you can get it recharged for $30 to $40 if it needs it.
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