[Blt2Lst]

I wish to convert my 89 caprice to 134a.
I have a mechanic bud who has done this conversion with the inexpensive retrofit kits that are available at the local parts store.
He says he has yet to have one come back.
I realize the correct way to do this is to flush entire system and change orifice and drier and comp oil.

My question is, how long can i expect this type of conversion to last verses the more thorough conversion?

Thanks for the help

Al