well, the good news is that the old one came off

the bad news is that the new one now won't go on

and yes, now i know how to do it, i won't spend so much time on it again, but it's something that i don't think is going to fuck up again but if i did it's easier to simply drain the ac system and remove the pump from underneath (once you've figured out how to get the fans out, because that means stripping out all sorts of shit ) and job jobbed in about an hour