1st check all hoses and radiator for any leaks you will spot these by seeing whiteish crystals (powdery) residue which is coolant.
It may also be your thermostat
As for the headgasket= normally mayo looking gunk in the coolant system and on the oil dipstick, lack of power, white smoke from exhaust, if you can do a compression test on each cylinder this will let you know 9/10
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