Are you actually overheating (temp gauge maxed out and steam coming from the overflow)? If not, I too would suspect combustion gases leaking in to the coolant side of the house.
Do you ever see white smoke (steam) expelled from the tailpipe?
You can use a coolant system pressure tester that adapts to the radiator fill opening to test for leaks.
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99' Suzuki Grand Vitara, 2.5 V-6, 4WD, 5 spd std
72' Chevy Nova. One owner, SB, A/C, power disk/drum & steering.
53' Chevy 3100 Pick-up w/327, TH400 trans w/78' Nova rear end.
03' Honda Odyssey (Momma's ride) Click for pics
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