Just wanted to report back that I finally swapped out my heater core and blender door over the weekend, and at long-last I've got heat!!! The swap took a while (10-15 hours) although I got it back together with no rattles or squeaks whatsoever. I'm sure if I had it to do over again, I could do it in about half the time now that I have a better idea of what I'm doing. Thanks again for your help AlanT - the directions you sent over were priceless.
