C-Lpilot
I am in Bay City, MI. I am not sure how many miles you have on your van, but when I took in my '04 for an oil change - they notices my intake leaking. they didn't realize that i had a warranty, and the dealer called GM direct, and said that GM would cover all but $250.
once i showed my "Warranty - DO NOT PAY CARD"
i was all set.
anyway - the dealer I went to was Roger McIntosh in Linwood. Excellent service.