Question about 1996 Buick Century

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96 Buick Century:Coolant Leak between pump body and engine block

My 96 Buick Century wagon is leaking coolant between the water pump body and the block. I have pretty good attention to detail so I might be able to handle the repair myself. Shop wants 600 dollars to install a 2 dollar gasket...mainly cause of the labor.

Is this a job that a shade tree mechanic can handle? Is there a good resource on the web for the procedure? Thank you.

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  • lesterallen May 11, 2010

    I may be able to help if you can tell me what engine you are working with.

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Please send me your email address and I'll send you the instructions. Takes too long to copy it here. lespaul1@suddenlink.net

Posted on Nov 21, 2008

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Hi Lester,
Its a Buick 3.1 L V6.

Thank you, Kent

Posted on Nov 21, 2008

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1 Answer

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Sounds like the gasket has gone (perished), the pump will have to be removed from the block, clean away the old gasket , make sure both surfaces are clean and fit a new gasket, use sealing paste as well and refit the pump.

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The water pump is not the problem if the recovery tank is full and no coolant is being sprayed onto the underside of the hood. the problem is a defective low coolant sensor which is very common in this car model and year. The sensor is in the radiator side tank and easy to replace as well as cheap, personally i disconnected mine.

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Feb 16, 2011 | 1999 Buick Century

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Replaced the water pump on our '97 Buick Century because we thought that is where the leak was originating. Replaced the hose from the radiator to the water pump as well. It is still leaking with fluid...


YEP YOU HAVE LEAK AT THERMOSTAT HOUSING.YOU NEED REMOVE THERMOSTAT HOUSING OUTLET AND CLEAN THE MATING SURFACE THOROUGHLYTHEN APPLY RTV SEALANT IN THE GROOVE OF THE WATER OUT LET HOUSING.INSTALL THERMOSTAT WITH SPRING TOWARD THE ENGINE TORQUE THERMOSTAT OUTLET HOUSING BOLTS 89 INCH LBS.IF STILL LEAKS OUTLET HOUSING COULD HAVE CRACK IN IT CAUSING LEAKING.

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My 1998 buick century is leaking coolant from the engine where the water pump is mounted.


it could be a loos hose clip or the water pump, there is a gasket behind the water pump this could be leaking as well there is a quick fix you could try if its a clip or gasket leaking it should stop the leak,but it wont stop a water pump leaking ,,,,,,,,,,,
get some "rad seal" and tip it into the rad,,,not the header tank it go's right into the rad then top it up with water and run up the engine itll its hot after a short time the leak should stop,,fords put it in all there new cars and vans that come out there fatctorise,, so if its good for them to use it,, it must work?

Mar 09, 2010 | 1998 Buick Century

1 Answer

I think engine coolant is leaking from the water pump. how do I know if its the pump or the seal


Technically, the 'pump' will not leak. A seal will leak and a gasket will leak. When someone says their water punp is leaking, they are really referring to a water pump seal or gasket or the hose that attaches to it.

You can use certain products to seal this type leak if it is small. However, it is only delaying the inevitable - you will eventually have to replace the pump. Find "Stop Leak" at fine auto parts stores in your community.

Thanks for your question at FixYa.com

Jan 09, 2010 | 1998 Buick Century

1 Answer

Coolant Leaking from Behind the Water Pump Body


This is a shot in the dark depending on how much it is leaking you can try a sealent called bars stop leak it is poured directly into the radiator (a cool one) and is run for an extended period of time you are not out much if it d'ont work. other than that you will have to have the gasket replaced with a sealent tempeture over 500 degrees good luck!

Nov 21, 2008 | 1996 Buick Century

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