DID YOU TRY A NEW RADIATOR CAP?THERE IS NO WAY IT COULD BYPASS THE RADIATOR,IT GO'S FROM BLOCK TO RADIATOR TO BLOCK RADIATON.IN A CYCLE.ARE A FEW THINGS YOU SHOULD CHECK,IF THERE IS WATER IN THE OIL OIL IN THE WATER,BUBBLES IN THE RADIATOR WHILE THE RADIATOR CAP IS OFF, THESE ARE ALL SIGNS OF...