[cduke]

I've gotten a R134a retrofitting kit from autozone and it says nothinig of cleaning out the old system. It just says to put on n the adapters put in a can of R134a, a can of their oil, and the more R134a to fill. Then you're supposed to apply the retrofit sticker and go.

What should I be doing to clean out the system first? I don't think I have any freon left but i'll check the pressures first. Any more ideas? Do I have to get all of the old oil out first? How is that done? I don't want to kill the compresser with too much oil of course!

I've read the Porsche recommended procedures and decided to go against that as it's not worth the time/labor to do the proper procedure; I'd rather do without than pay for the $600 retrofitting procedure.

Thanks!
CD