As previously posted was considering on charging my AC but here in Canada R12 is illegal. Bought a cheap retrofit kit through Ebay for approx $49.00 but was told that the kits are suicide to the AC system. Anyways went to an AC shop and asked them to evacuate the remaining R12 but the shop owner quoted me $195 just to evacuate. Outside the shop one of the techs approached me and put a pressure gauge on the low side, which showed very little - he pressed the high side and it hissed for 3 to 5 seconds. He told me that I must have a bad leak and that I would have nothing to lose to try the kit. When I went home I just snuged on the adaptor to the low side started the car with the AC on high and snapped on the charge hose with one canister containing ester oil, sealant, conditioner and R134a and then ditto for a second can. The weather up her in Toronto, Ontario has been hot with temp. 25 to 27 C but in traffic my outside temp gauge reaching 30 +. Have been using my AC constantly for a week and it seems to work great - have just today checked the pressure with the gauge provided and it hasn't gone down.