Yes, it's always good to let the engine and the extended heating of rubber, plastics, etc.to cool off. In my case it prevent the damn mice to use my car engine area as free housing! We have the damn ground squirrels too! Both such nuisance, but they are here to stay, so we have to take all measures that we can to protect our cars and home.I occasionally do the same thing- pop the hood after the freeway drive to let the hot air out. I don't know if it does any good, but extended heating of rubber, plastics, etc. isn't beneficial. We're some 440 miles south of you, and around here it's the damn ground squirrels that are destructive.