If it's not boiling over, it's not getting much hot. Try an infra-red thermometer to check the temps at various places on the cylinder head, water jacket, liquid in the radiator top tank, radiator outlet, etc. They're very inexpensive, particularly if you shop Ebay. I use mine frequently.
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!