451 overheating, even when moving

Mounting the toy fans dire ct to the rad does nothing, probably makes it worse. Air is NOW only pulled through the core where the fans are. A large area of the rad core is not working for you.

You need [a] a shroud that pulls air through all of the rad core & a large 18/19" mech fan to do the job.

Here is where people go wrong with this: they fail to ensure that their cooling system is going to get the job done under the worst conditions that could be encountered: stop/go traffic on a very hot day.