Probably a dumb question I know but I did look through the postings and everything just says to "loosen the radiator coolant valve" which makes me feel even worse that I can't get mine to loosen. I found it easily, it is a black plastic wingnut looking thing sticking out the back of the bottom of the radiator. I'm assuming it unscrews counterclockwise but I sure can't get it to budge. I haven't resorted to using a small pair of pliers yet as I figured I'd better make sure I'm correct before I manage to break the tabs off and really be in a pickle. It's a 2004 and I'm assuming it's never been opened and I'm just not twisting hard enough? Any hints or tips? I'm sure I can handle the coolant change myself, I hate to take it to the dealer and pay $90. I already bought two gallons of Honda coolant. Thanks!!