if i had a bad a/c system and the evaporator was 17 years old...I think I would add that to my list of parts needed.

from what I have seen over the years..only the condensers hold up...and of course they are about the easiest part to access.....

I think the biggest mistake we all make is not replacing the driers every 5-6 years since they remove the deadly moisture from the systemm..

just my thoughts... I am far from an expert.....