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2004 Buick Rendezvous engine keeps overheating

eng continues to overheat in 2004 buick rendezvous with 3.4 new thermostat, new cap , flushed and refill new top hose . still overheating

Maybe leaking intake manifold gaskets or possible head gasket.

never low on antifreeze it is always blown back into reservoir

Clogged radiator maybe? Exactly when does it overheat? In slow traffic? Highway use? Does the electric cooling fan come on when hot? Does a second fan, or does the single fan run faster when the AC is turned on?