77 Type LT ... My A/C R12 system needs recharging ... I see a lot of ads these days about converting to the R134... WIll anyone having some experience in this area please share their experience ...good or bad... I've have spoken to 2 shops .. 1 was for conversion...the other was against it ... I am told that the cooling effiency suffers and, of course there may be additional cost. My wife is the original owner of the car, so it is a keeper. I am mainly interested in a quality repair. I'll pay the higher cost for R12 is that is going to give me the most satisfaction. Comments please??