First of all thanks for all the help. I monitored this site for months and gathered info before buying my car. It has a ways to go but it is what I have always wanted. I have a 69RS/SS that I am starting to rebuild. It has factory air. I am trying to get the A/C in order, since the car is at my uncle's shop 2 hours away. Has anyone converted their factory air over to Freeze 12 or R134A. I have been told taht you can and that you can't w/o buying some additional parts. I am buying a new POA valve and a new expansion valve, I am wondering if I should buy the POA update that Year One sells. Not even sure what it is. But in the same page it says taht the expansion valve won't work with R134. I need advice.