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Yes. I did it !!! I ownself repair my car aircon - Change Evaporator (Cooling Coil) ($130), Discharge Hose ($45) and Compressor ($230). I bought new tools like Manifold Gauge, Quick Release Connector and 1/2" ACME Valve - $50, Vacuum Pump - $130. It take about 1.5 day to replace the Cooling Coil and 4 hours to replace the Compressor and Discharge Hose. Yes, you can buy these small canister and ownself fill up. But, how much to fill up ? For my case, my car need 680g of 134a - 2 cans. Kaltech Engineering & Refrigeration Pte Ltd 9 Tuas Link 1 Singapore 638587 www.kaltech.com.sg - They sell 340g 12oz canister to 13.6kg cylinder to 20000 kg 134a Refrigerant. As for Manifold Gauge Set - www.aliexpress.com Compressor - www.aliexpress.com For Original KIA part - Buy Korea @ www.koraps.com The repair is quite extreme and very labour intensive. I don't recommend you do it, if you never even ownself change a serpentine belt before. I even added a tracer oil so the next time it breakdown (touchwood) I can trace the leak with a UV light.

Some of the people claimed they are same, only R-134a is for 'O-zone friendly' & R-12 doesn't' the below is just translated from the http://www.nutec-japan.com/nc-200.htm