Any tips/ tricks? Im heading to Colorado in 2 weeks and am going to do a thermostat change and figured I might as well drain and replace the coolant while I am at it. I dont have any temp problems but the coolant looks old and I have no idea how old the thermostat is. Seeing how I am going to be pushing big passes that its not used to, I am airing on the side of caution and making sure that everything is tip top. Its an 83 BJ60, no a/c and no rear heat BUT it does have the lines and everything that runs under the truck to where it would be and then loops back to the engine compartment.