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Would a water pump be bad if it does not leak? what would make it run hot

(2003 Nissan Xterra)
in Avondale, AZ on November 04, 2012
i can dirve arround town okay but when i get on the freeway for 10 to 15 min it gets hot, it starts to cool down if i turn the heater on i also checked the thermastat but there wasnt one there could that be the problem
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Popular Answer
on February 25, 2014
Thermostat could be the problem but I doubt it since it's running without one. Maybe put one in and see what happens? Also try flushing the radiator.
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