About to do a coolant flush on my 04, 3800 Series II. Anyone know where the engine coolant drain is located? I’ve heard a couple different things from different sources. Some say it’s the same threaded holes as the knock sensors, some say theres a drain plug above the oil pan, and some say there flat out aren’t any. don’t particularly feel like laying under the car for hours scratching my head wondering where the hell it is, taking things apart that don’t need to be.