Evaporator went out on my 2017 a month ago. Trying to explain that to the dealer is like talking to a brick wall. Parts guy couldn't even find evaporator core in the parts list. They act like I don't know what I'm talking about. I'm not keen on taking my baby to them but it's under warranty.
Glad I found this forum and thread. Just purchased complete GT 350 take off: intake, throttle body and CAI for a great price. I'll be returning here to get a tune and likely with more questions.