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water pump on 1999 Nissan Quest

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my van is over heating so i figured it was my thermostat so i changed it but it still over heats. is it the water pump and if so what steps do i take to remove the old one and replace it with a new one?
(1) Answer
If system is full then could be water pump if the impeller is bad and not moving coolant thru system. May also be clogged radiator or a/c condensor not allowing air flow, could be radiator not flowing, can find out if use infrared temp gun to check for large temp differences at the radiator core, good luck.