Ok i have replaced everything that i can think of and it is really making me upset. i had a new radiator put in about 6 months ago and ever since then it has been over heating from time to time. well i had the radiator hoses replaced and the thermostat and it is still over heating. i really need help and dont have money to keep doing this. and when it over heats it has a knocking nose towards where i assume the heating core is.
Engine overheating? Try this procedure:
Hi Kim,
I can feel your frustration. It sounds like you've done all the logical stuff already. The "donut hole" in your process would seem to be not changing the water pump. The water pump as you might imagine, is responsible for circulating (pumping) the relatively cool water in the radiator into the running engine that contains the hot water. Hoses connect the two together. A thermostat is between the radiator and the engine. Once the water in the running engine gets to a certain temperature, the thermostat opens allowing the water pump to send cool water into the engine and hot water out to the radiator to be cooled. The heater core is usually on the passenger side firewall area.
It sounds like the water pump is the only thing left to change - if it isn't working - it can't circulate the water - and will result in overheating. Lastly, a clogged heater core shouldn't cause the engine to overheat - in fact, if the engine begins to overheat, you should turn the heat to HIGH fan and HIGH temperature to help remove some of the heat in the coolant.
Good luck!
SOURCE: 2004 NISSAN ALTIMA 2.5 NO CABIN HEAT..ENGINE AT OPERATING TEMP.
If the engine is not over heating than most lilely it isn't the thermostat or waterpump that is causing the problem. Check the heater hose coming out of the manifold and see if it is warm to hot. Next check the return line from the heater if it is still cold or moch cooler than the inlet, the most possible problem is the heater water control valve if this model has one or possible the core of the heater is plugg with slime cause by some antifreezes setting during the summer months while not being used. If this is the case than remove tihe two hoses and back flush the heater core with water pressure until it runs clear. I have had this problem before and this cured my problem. I also had to flush the engine and radatior also. Hope this help. .
SOURCE: I have a 94 nissan altima that overheats. I
sounds like where the water pump meets the engine has warped or the gasket has been blown. Since the water pump has to come out anyway to fix it then i would suggest replacing the pump. It is 30 to 40 more.
SOURCE: nissan path 95, boiling near to over heating
It certainly can cause the condition, but so can TONS of other items: coolant level, bubbles in the coolant (air bleeds), reaiator restrictions.
You could test the thermostat, pull it and put into measured temprature water and observe it as you raise the temprature...
SOURCE: 92 Nissan stanza has overheating problem. Radiator
Are you losing coolant? If yes, then go for a radiator compression test. You might have a bad cylinder head gasket.
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