I think I flushed the whole thing, I disconnected the bottom hose and than ran a hose through the top and ran the truck for 5 or 10 minutes. If so I figured out the reason the coolant wasn't filling was because I needed to jack up the front of the car. As for the reservoir is there an easy way to take it out the only way I'm seeing is two bolts that look pretty difficult to get to. Thanks for your help