antifreeze boiling in resevoir

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I HAVE A 2002 CHRYSLER 2.7 I JUST REPLACED THE WATER PUMP AND TIMING CHAIN AND GEARS BECAUSE THE PUMP IMPELLER WAS ALL CHEWED UP I REPLACED IT WITH A METAL IMPELLER IT HAS A NEW THERMOSTAT NEW AIR BLEEDER I HAD THE HEAD GASKETS CHECKED OUT BY A PROFESSIONAL MECHANIC ALL TESTS CAME BACK NEGATIVE,THIS IS WHAT HAPPENS YOU CAN RUN THE CAR FOR ABOUT 15MIN THEN THE ANTIFREEZE STARTS BOILING IN THE RESERVOIR BUT THE HEAT GAGE ONLY GOES TO ABOUT HALF WAY THE CAR ONLY HAS 87000 MILES ON IT IF YOU LET THE CAR COOL DOWN AND PUT MORE ANTIFREEZE IN IT AND START THE CAR YOU CAN WATCH THE ANTIFREEZE RISE AND THE START BOILING OVER PLEASE HELP I'M ABOUT READY TO PULL MY HAIR OUT.