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From what I have seen and come across in researching this problem on this very vehicle, I have found that the most likely and unfortunately common cause of this problem is the intake manifold gasket. It is so common infact that I have found manufactures of upgraded gaskets to counteract the OEM replacement, which was also supposedly beefed up to address this problem. You probrably want to have a pro do the repairs, as it is rated at an 8 hour job. That is if you can afford the 8 hours at their shop rate.

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Q: Your 2003 buick century is overheating and losing antifreeze What may be the problem?
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