Had a customer come to the store one time complaining that his late model pkup was running hot after a local mechanic had put on new water pump and fan. (Don't know why he did a fan).
He insisted I go out to his truck and see what was wrong. As I was standing in front of the pkup, I noticed I was getting pretty warm. It dawned on me finally that he had the wrong direction fan. It was pushing the air out the front of the truck. At idle it would be okay, going down the road it would heat up.
