Dang. So I went to work on changing out the heater core. What are these engineers thinking when they design this stuff? Half the time, bolts are practically not accessable, you need the hands of a two year old and a total mastery of yoga to get into half the places. It just don't make sense other than they want it to be difficult so that you have to take the care to a mechanic, thus ensuring a market for their parts and service. Totally upsetting.