Since we don't get much extremely cold weather in our neighborhood, using the radiator cooler and the auxiliary in tandem isn't a problem. In the far north frozen wastelands (anywhere north of Kentucky) it's possible to over-cool the trans fluid in the winter.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!