I've seen this alot with nissan and the sometimes is just this simple... most the nissan motors have a type of bleeder bolt or something (not sure what its called) on top of the motor and that should be removed while filling radiator. step 1 wait till engine is cooled down all the way. step 2 remove radiator cap. step 3 remove the bleeder bolt on top of motor (look around for it. Its just a little old bolt all alone) step 4 slowly fill radiator until coolant/water to come out of the bleeder hole. step 5 put bleeder bolt back in. step 6 put radiator cap back on. thats it. good luck
if you do not do these steps air get caught in the system and when heated turns to steam. and your radiator cant circulate that steam because the hot air raises. The steam will just sit at the top of the motor and block the coolant/water from circulating through the radiator like it should. Without it passing through the radiator correctly it will not cool. Having a new radiator helps because when they installed it they probably filled it correctly (by removing that bleeder bolt). they knew they could have but filled the old one correctly for you but there isnt any $$$money$$$ in that for them.
BLEEDER BOLT FOR COOLING SYSTEM This is on a V-6 Xterra. (i believe)
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Probly not. Unless the pump is run by it's own belt which broke. Usually , a pump is good till it starts leaking all over the place.
Please explain overheating problem more. Is it while you are driving , or when you are stoped in trafic. Does it heat up and overheat very quickly after you start the car. Is it really overheating , or is your guage just showing overheat.
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