Question about 2003 Nissan Maxima

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Over heating problems

Having an issue with my nissan. notice a little coolant leak on the floor but can't locate the leak tried many whays. The engine overheated while driving hoome and it seems that the two fans don't work!!! could that be the problem and any suggestions to foinding a leaky radiator or hoses

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If you have water leaking inside on your floorboards it is your heater core. Normally not very expensive.

Posted on May 25, 2009

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If you have a coolant leak in the car that is caused by a leak in the car's heating system - either the heater core or the associated hoses and connections.

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If the heater core were leaking coolant, the fluid on the floor would be oily not clear.
When the engine is warmed up, are both heater hoses hot ?

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First check and make sure that your coolant(antifreeze) level is full, the hot coolant runs through the heater core and than air is blown over the heater core heating the air for the heater. if the coolant is full you than need to check the thermostat and make sure it is functioning properly. finally if both of those are not the problem it is possible that your heater core is bad, however if the heater core is bad you will notice coolant leaking onto the passenger side floor. so if the floor is dry I would say the heater core is not the problem

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If so, you could have a faulty thermostat, an air pocket in your cooling system or maybe even a leak somewhere. My truck's heat would only work while I was driving, then stopped working altogether while the engine started to overheat. I changed the thermostat, then the heat would blow hot/cold/hot/cold, I didn't realize you had to bleed the air out of the system after changing the thermostat. I did that and now the heater and engine run great.

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Try feeling the floorboards inside the car for any wetness. It sounds like your heater core may be your problem. When they start to leak they can go unnoticed as the coolant goes down to your floor pans and running out anywhere it finds a place to. If you have been having issues with low heat I would bet this is your problem.

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Better have it checked for a possible headgasket leak. This can destroy an engine!!! (They can leak coolant into the engine oil)

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