Question about 1989 Nissan Maxima

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1995 Nissan Maxima Over heating, no heat blowing, water not moving

I have a 1995 maxima that has some sort of problem with teh cooling system. I have replaced the thermostat, radiator (had a crack) and water pump. The water gets hot and boils out the overflow. The heater no longer blows hot air but extremely cold when on full blast. The fans on teh radiator work. I can't test without the thermostat because it is all connected with the housing but the one in right now is the second replacement in 2 months. What could be wrong with it? After fixing water pump it ran great for a couple of weeks, then the radiator cracked and I replaced it. then it ran again for a week or two without a problem and then started heating up again.

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Simple thing to test first would be to pressure check the radiator cap. Next would be to check for combustion gases in the radiator indicating a leaking head gasket.  It is an aluminum head and iron block engine and there is a possibility that antifreeze anti corrosionpackage runs out due to over age then fails due to too long in the engine it results in galvanic corrosion at the head gasket-commonly resulting in a failed head gasket.  There are other engines that are vastly more prone to this than the maxima engine.  If there is a leaking head gasket the gases could rise to the top of the system and block the water flow into the heater.  Listen for gurgling sound in the heater.

Posted on Feb 10, 2009

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