ok, today i was flushing out my cooling system with the help of the chilton...i was able to find the engine block drain plug on the left side (closer to the alternator), but i couldn't find the other one...no matter how i look in the book i can't seem to find out where it is.....or is just openin one of the drain plugs gonna let all the old coolant out....and another quick question..is it necessary to open the air release valve the book talks about after refilling the system back up, or does it not matter??