R12 to R134 conversion question

[Bill R.]

old r12 but the manufacturer states that the r12 and freeze 12 are compatible with each other and will work fine

right, I've read you dont really have to evac the old r-12, but it is recommended for environmental reasons, so that if another shop were to have to evacuate the system, it would be pure which can be recycled/reused rather than a mix.

[MicahO]

It's also tough to tell how much is actually in a system, and since you don't want to overfill it, the best baseline is an empty system, plus 75-80% of the R-12 recommended capacity.

I was quite concerned about the overfill possibilities, and decided to take the safest route. It also happened to be the legal way to go.

old r12 but the manufacturer states that the r12 and freeze 12 are compatible with each other and will work fine