Question about 2002 Nissan Altima

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Overheating engine It started with a radiator leak. I put some Bars Leaks in the radiator to stop the leak. Now it overheats when the car is going down the road. I can idle with the a/c on all day but once I go down the road about 60mph or more the car overheats. I replaced the thermostats (it has two on this model) and the waterpump. I took the radiator off and water is flowing through it ok.

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Hello shotmaker25...If you put Bars Leak in the cooling system and it plugged a hole in the radiator it's also plugging the the cores inside to some degree... A radiator shop should be able to diagnose a clog, if it exists. The rad can be removed and flow tested. A shop that has a hydrocarbon sniffer can also detect if combustion gasses are getting into the cooling system with a probe...The cooling system must be bleed and purged..if air is trapped in the system, your altima will overheat..If the catalytic converter is plugged, it will overheat... Make sure the cooling fans are working..they should cycle off and on.
Good luck...i hope this helps...please rate me a fixya.

Posted on Jul 28, 2009

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You have gone through a lot of trouble so far replacing parts. I wouldn't rely on rad additives for a fix sometimes they do more harm than good. You could just have an air lock in the coolant system. Did you try running the vehicle without the rad cap for awhile to release any air locks that may have occurred? Have you tried a new rad cap? Hopefully this advise helps you some what.

Posted on Jul 28, 2009

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You have to check the cooling fins of the radiator .if thermostat and the other parts for cooling the engine is fine.If it still is not working replace the radiator.

Posted on Jul 28, 2009

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