I never drain my radiator to clean my Throttle Body. There are 2 hoses on the bottom of the Throttle Body, the one on the left is the one that spits out radiator fluid. I usually just stick a bolt into the hose opening to stop the fluid from coming out. The right hose will have some fluid that comes out but not enough to evan make a difference. The book is more of a guideline and this site has all the shortcuts needed to make your job much easier, I'd take experience over a book anyday, hope this helps.I was going to clean the TB, but didn't have coolant on hand to re-fill my rad after draining to get the TB off. Ill get the TB cleaned on the next rad flush.