May or may not make a difference, probably wont, but preventive maintenance never hurts. Things get hot under the hood, its 200 plus freaking degrees in there, and the exhaust will get even hotter. The hood rod is directly above the rad and its usually too hot to just grab once the engine has been running. What makes you think its hot? Never heard of a prop rod being too hot to tuch as a way to determine the engine is too hot.