[TonyHuynhTwo]

I just retrofitted my r-12 system took like five minutes and now my a/c is working fine. A lot of local a/c specialty shops will vacum out your system for free as long as they can keep the r-12 (you gotta call around). Although r-12 and r-134 will turn into a solid when mixed, you don't have to have your system completely flushed out with alchohol or nitrogen if you have it vacumed out. The amount of solid material left in your system would be ridiculously tiny and be concentrated near the leaks in the system plugging them up (as long as your running the car and air conditioner while your doing the retrofit, like you should). The retrofit kit comes with everything you need to be blowing cold the refrigerant, oil, recharging hose, port adapters, and idiot proof instructions. As for the ES refrigerant stuff I honestly have no experience dealing with it, but since the a/c specialist at the place I went to won't even deal with it I'm not going to touch the stuff even if it might blow a couple of degrees colder. My r-134a converted system blows cold and thank god has no leaks. At a cost of just $35, I'm a pretty satisfied customer.