So the old AC is not blowing as cold as it used to and I'm thinking I might be a little low on Freon. The car is a '97. I'm not sure if I need R12 or the newer CFC-less R134A. I've heard from some Primers that it's R12 and I should update my system with this upgraded part 38020-SM4-A1AH so that I can convert it to R134A. And I've read in the WIKI that Acura went to the R134A system in '93 so that is what I should be topping off with and I don't need to order that upgrade and install. Can anyone say for sure which refrigerant I should be using? Thanks in advance.