Thanks guys, I'll give it a shot this weekend.

Brownbag....I never ran it with the R-12, just got this thing about 6 months ago and the A/C never worked, so 134 is gonna be way better than the hot air it blows now. <img src="/forums/images/graemlins/wink.gif" alt="" />

How do I go about getting rid of the old oil? Most of the 134 I've seen in the store has the oil in it, so I was just gonna re-charge the system with that, after changing valves, with the new oil in it, but I should be getting rid of the R-12 oil first? Is the old oil sitting in the accumulator, and can I just drain from there? Also do I need anything special to swap the valves out, tools I mean? Thanks.