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Overheating in my Trialblazer (2003)

Dear Experts,
Help me identify what would be the cause of overheating in my trialblazer? I suspected the fan clatch and changed, malfunctioning of the thermostat and replaced it. But still my car is overheating. What challenged me is the overheating will be sever while accelerating. When driving above 60miles/hr, it gets hot faster. If the engine runs at partking even with the AC on, the heating willnot be that serious. The atmospheric temp reaches 100-120 degrees.
Advise me with what would be the cause of this problem.

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Bad water pump? Is there circulation in the radiator?

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