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Pushing antifreeze

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Hello.  I'm new with Mack trucks.  I have a 98 ch613 E7-427.  It started pushing antifreeze out of overflow hose.  I called Mack to question them.  And they were good and full of answers, but the wrong ones I think.  To this date I replaced the air compressor(per Mack).  The water pump,water , pump housing(per Mack),fan clutch, thermostat and reservoir cap.  When started it up it pushed about 3/4 gal of antifreeze out.  Never went over 190 degrees. Ran it for about 2 1/2 hrr at 1600 rpms.  Did bottle test and was getting some bubbles but not all the time.  Should I go deeper?  I pull a walking floor trailer and haul heavy mulch with it. Thanks in advance.

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