these forums are great at night.....who'da thought i would be reading about dog farts...i love it guys...keep it up!! although i have never had a foul smell in mine like you are describing...good luck figuring it out......i know that there have been a lot of people complaining about the a/c stinking some...but nothing like you are describing....this is more like a mold smell
2000 Silvo 5.3L, 4L80E, 6" Fabtech lift (bad idea) , 33's, K&N, Gibson headers, Magnaflow Exhaust, HD Hood, JBA plug wires, 4.10's w/auburn posi, radix'd