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Hi, my name is ***** ***** you checked the coolant level yet? if it gets low, it can get a air bubble in the heater core and cause the intermittent heat, and also cause the overheating.
ok, if it full, then you most likely have a blown head gasket, this will allow combustion gasses into the cooling system, and gasses will get trapped in the heater core, also causing the intermittent heat, has a block test been done on the cooling system yet?