All of the seals should already be compatible with whatever you plan on
using. But you will need to flush the entire system to remove all of the
oil.... because you cannot mix the two types of oil. Also, R134a will run
at a higher pressure than the R12, so if you have any weak spots that
weren't leaking before they might start.

"Chris Garcia" <chris@evangar.com> wrote in message
news:Xns9496C7B051495chrisgarcia@68.1.17.6...
> My wife's car (91 Civic LX) has a dead A/C .. The compressor itself leaks.
>
> I'm considering buying a remanufactured compressor and was wondering if
> it'd be cost-effective (since the compressor is already out, and should be
> empty.. right?) to just go ahead and get the system retrofitted. Are there
> seals elsewhere that need to be replaced?
>
> Thanks!
>
> --
> -Chris
> http://www.ChrisGarcia.com - My Homepage
> http://www.Evangar.com - Affordable Web Hosting, and much more!