if im right you have the 3.2 or the 3.5 both motors are very bad about the water pump going out. also could be as minor as a thermostat but if i had to guess id say the water pump.
That happens because the engine is overheating. Normal causes are low coolant, bad thermostat, or inoperative fan.
Overheating is due to, well, the coolant in the cooling system getting too hot. In a normally operating engine, this should never be a problem. First, check that the coolant level is correct. If it is correct, I would suspect a problem with the thermostat. When the engine is cold, the thermostat closes off coolant flow through the engine until the coolant reaches a pre-determined temperature. When that temperature is reached, the thermostat opens to allow the coolant to circulate at that exact temperature. Thermostats are known for failing and either not opening or not opening enough at that pre-determined temperature. This causes coolant to get trapped too long in the engine coolant chambers, heating it beyond limits, causing the engine temperature to increase and possibly overheat. If my Maxima was overheating, I would check the coolant levels and then possibly replace the thermostat. It usually is no more complicated than that.
lack of coolant, check for leaks.
The engine is overheating. The check engine light is not on because you have no problem with the emissions system which this light monitors.
The fan comes on and run continuously when the A/C is engaged which is normal. It will also come on to cool the coolant in the radiator to prevent the engine from overheating once the coolant reaches a predetermined temperature.
Lack of coolant, lack of coolant flow, air in cooling system, lack of airflow over radiator,........
If you mean engine coolant is getting into the car, the heater core is leaking coolant causing the coolant level to drop and that causes the engine to over heat.
at the bottom of your if it is cold or warm then it controls body temperature
The most common causes would be low coolant and inoperable radiator fan.
Possible causes for overheating include failed serpentine belt, failed water pump, internal or external coolant leak, restriction in the radiator, or inoperative radiator fan.
Can be leaking intake manifold gaskets, which can sometimes be fixed by using Dexcool coolant. Can also be a head gasket.
Overheating Low coolant Defective radiator cap Stuck thermostat