If the coolant isn't boiling, the engine is not overheating. There's a good reason today's temperature gauges have "cold" and "hot" indications, not degree measurements. "Hot" on a gauge for a cooling system with a 15 pound pressure cap is close to 260 degrees. People would get a case of hives if they knew how hot their coolant actually gets in a traffic jam with the air conditioner working hard, but the engine strolls merrily along!
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!