It looks good, that's about all. When you really need it, while the engine is warming up, it's as useless as windshield wipers on a duck's butt. Exhaust gas is several hundred degrees at a minimum and it happens s soon as the spark plugs fire. Coolant gets up to 200-ish degrees after several minutes of operation. As the pointy-eared guy on Star Trek would say- - - -"That isn't logical!"
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!