So, I thought I'd let the group know how I fixed the cold air issue on my 100. The cabin air filter door wasn't completely seated against the airbox, and was creating a draft. Once I seated it fully it made a significant improvement. I also had cold air coming through the seam in the 2 parts of the airbox as @ClassyJalopy referenced above. I bought some insulated tape from Home Depot and ran it along the entire seam. Problem solved, and happy wife!