[cebra]

Pretty sure they are trying to sell you something you don't need. Piece of advice, fill the motor with coolant through the upper radiator hose (take the hose off the radiator) then fill the radiator. With my hose setup (stock Silverado hose) it is above the radiator and since the t-stat is on the bottom, well the engine was empty and I roasted it. I don't know why this isn't posted all over the board that you will have no water in the motor if you just fill the radiator as the cold water sits against the t-stat and won't get into the motor. $1K lesson learned.