ok my radiator hose is really lose and has been touching the engine by the oil cap, this has been causing it to kind of melt, which makes me want to replace it. dont need it melting through and spewing coolant every where. i see it has to clamps with flat head screws so i'm not to worried about being able to replace this. I just want to know if i need to drain the collant be fore doing this? it doesn't feel like there is anything in the hose when the car is off so i'm assuming no. am i wrong?