Evap Canister
#1
#2
AFAIK it does not, I just replaced one on a 96 Jeep cherokee with a 5.2 in it and before I did that the AC and Heat worked fine. I replaced it because it was broken it half, only the top part was still connected.
Search this forum for "wild vents" There is a writeup on how to fix those kind of issues.
Search this forum for "wild vents" There is a writeup on how to fix those kind of issues.