Is the radiator new or does it need replacing?
Is anything restricting air infront of the radiator?
Is the fan shroud missing?
Is the thermosat working properly?
Is any of the water hoses restricting water flow?
Are you losing any water?
Just a few experiences I've had in the past... My guess is the fan/clutch are not the problem but of course I haven't seen or know anything about your car.
Good luck.
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