u have to purg the system. on the back of the block, on top, next to the valve cover, driver side, is the temp sensor. it looks like a small spark plug, with a wire going into it. pull the wire off of it, and un skrew. air will come out then coolent, put it back in, p.s. un skrew the radiator cap, and point the nose of the car down hill, befor u remove the temp sensor. u might have to do this more than once, do every thing run moter to opp temp, then trun off, then do it agin