I just ordered a Robinair vacuum pump (already have manifold gauges) and I am going to convert to R134a in my 91 L. I will need to order a 134a expansion valve for a 94 - 95 model and a receiver dryer, which I understand is the same for R12 or R134a, right? I am going to save money for now and use the original condensor and see how it does. Crossing my fingers that my compressor is good, which it should be. The last time I had it off the car, I emptied it of the old oil and put in Ester oil in preparation for the R134a. The manual said to fill it to 70% of capacity, if I remember right, which I did. The low side valve is very close to the hood, so I guess I will have to use a 90 degree R134a adapter? Anybody know what size adapter I need for the high side? Thanks, I have been driving home in 103*F weather (my ext temp on my console went up to 111*F one day!) and I am feed up! Oh, and I will replace my seals with the green ones.