Greg, great info...How many green oring seals are we talking about on your car ? Did you have to take the evaporator out from under the dash to install the 134 expansion valve ?
After flushing with any non 134 liquid I would suggest flushing with which ever type oil will finally be in the system until it also comes out clean... and keep blowing air until all of it comes out that will reasonbly come out.... Mineral Spirits , etc may have things which as residue would form gunk or acids...etc.... Thanks, Greg