Question about 1998 Chevrolet Malibu

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My 1998 chevrolet malibu 3.1 v6 replace hoses and still overheats and coolant check for leaks and no leaks.

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  • Johnny Tumlinson May 25, 2011

    Does it overheat on the highway or just in the city?

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  • Chevrolet Master
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Try replacing the thermostat with a higher rated one.

Posted on May 25, 2011

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  • Master
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Very common for the intake manifold gasket to leak on that engine, meaning the coolant gets sucked into the engine and either into combustion and out the exhaust or into the oil pan. so sniff at your tail pipe for the sweet odor of anti freeze which may mean also a whitish greenish smoke and a green stain or look on your dipstick and under the oil fill cap for a frothy foamy residue. it is not good in either event. i had one which had a crack in the cylinder wall lmeaning after i did the intake gasket it was still bad so i had to replace the engine.

Posted on May 25, 2011

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  • Chevrolet Master
  • 5,332 Answers

When it is "overheating" feel the upper and lower hoses. If one hose is hot and one is a lot cooler than you have no flow through the radiator. Most likely cause for this is the thermostat.

The thermostat is located behind the housing that bolts to the drivers side of the intake manifold that the upper hose is attached to. It is not the easiest job in the world to replace but it can be done.

Posted on May 25, 2011

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If your car is equipped with a 3.1 or a 3.4 litre V6 and you have preformed all of the above listed work then I would have to say its the intake manifold gaskets. They commonly blow on these motors. Just a design flaw, nothing but replacing them when they leak can fix this. Also run a coolant pressure test on the system to check for minor things like a leak that you cant see from visual inspection. Hope this helps.

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Every week or two I have to add coolant. My low light comes on but cant find a leak. There are no spots on my driveway, but dont where the anti-freeze is going. Mike Salantai


the intake manifold gaskets on these are known to leak. the coolant leaks inside and runs into a cylinder and is burned up in the combustion process so you'd never see an external leak. i assume its a 3.1 or 3.4 v6 both have the same problem

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