Mitsubishi Repair: Air Conditioning, 134a freon, r 12 freon

Question
How do I convert R-12 refregerant to R-32 (air conditioning ) 1992 Mits. eclipse 1.8L non turbo
manual. I purchased a converter kit, but what other precautions do i need to take. Thanks

Answer
Kelly,
If your system still has old R-12 refrigerant still in it, by law, it should be evacuated by a qualified technician; and it violates ferderal laws in all states to release it into the atmosphere.  Though if you're current system is no longer blowning cold air, and you're converting because you cannot find R-12 freon anymore, then you should first figure out why your old refrigerant leaked out.  You may have a leak in your condensor or one of your AC lines.  If there is a leak, all the new refrigerant will leak out as well.  Most cans of refrigerant that contain what they call "stop leak" really don't work well to actually stop leaks.  At best, they may just slow down a leak a little.

But if you're simply looking to convert, then you should always remember to only fill the A/C system on the LOW pressure side.  The low pressure line should be marked with a valve cap labeled with an "L".  It's also usually the larger of the 2 lines that have valves.  If you want to be sure, you can purchase a service manual from most any auto parts store that will point it out to you.  Also, when filling, be sure you keep an eye on a gauge to be sure you do not over fill the system.  The pressure in the AC lines can exceed 200 psi, and too much freon can damage internal A/C components.  You'll also want to be sure to proportionally add the correct amount of refrigerant oil (usually PAG or ester oil) to the system with a measured amount of freon.  Most cans of R-134a freon that you can purchase in the stores have one of these oil in them already.  But be sure you have the proper ratio.  Too much oil will reduce the cooling effect from the A/C, and too little oil can cause the compressor motor to fail.
Good luck!