Originally Posted by Capt.Bill11
It's got nothing to do with the engines over heating. It can have everything to do with the engines getting the correct amount of ambient temperature intake air.
Whatever the position about that, after several hours running it is noticeably less hot in my ER if I use the blower than if I don`t. It is the difference between happily going in there to do something, and deciding it is too hot to be in there safely and not doing that something until it cools down somewhat.