I have two Saab fans in mine, have a look in my photo album and you will see them.
I have a double core police/mil spec radiator which had a switch mount on it, I also have (although not reconnected since my bulkhead change) an override switch.
If I am going to knowingly walk away from it with the engine running I switch it on so it doesn't get hot enough in the first place (leaks more oil when its hot!).