Glad to know that. I was able to pull the engine and tranny out of my MINI Cooper without opening the A/C system, and I may need to pull the engine out of my Explorer. I have a knock that shows up after the engine is warm, and I am trying to work through the diagnosis to make sure it is or is not a rod knock. The symptoms are I get a clatter when sarting up cold, quiets down and sounds normal until the engine warms up then I get a knock that stays with engine rpm. My next check will be to warm it up, pull the serpentine belt and listen to see if it is still there or not. I had new timing chains put in last year and the overhaul warranty is out. Just my luck.