I use a laser type temp gun pretty frequently to check different places on the block, the cylinder head, the thermostat housing, and the radiator to monitor how well the temperature is distributed in the cooling system. A localized hot spot indicates low or maybe no coolant flow in that area.
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!