By the time you see bubbles in the radiator, things are in really bad shape. I'd suggest checking for bubbles at the engine, and pulling the belt to prevent any splash. If it's getting hot already, I doubt if a retorque will help.
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!