Intake Manifold Gasket May Leak Coolant or Engine Oil on Buick Century

The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Our technicians tell us that operating the engine  with a coolant/oil mix can result in internal engine damage. Replacing the intake manifold gasket should correct these leaks.

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Average mileage: 99,436 (26,000–277,684)
Engines affected: 2.2L 4 Cylinder, 3.1L V6, 3.3L V6
14 model years affected: 1991, 1992, 1994, 1995, more1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
150 people reported this problem
87 people shared problem details
Experiencing the exact same, known issues with my Buick Century 2001 as mentioned in the Dex Cool lawsuit of 2008: Unfortunately, I was not aware of that lawsuit or I certainly would have filed a claim to cover the cost of repairing a failed Intake Manifold gasket and seals. My car's radiator has a brown sludge in it, which has contributed to a leak as well as corruption of the coolant sensor and the overflow bottle. I called GM Customer Relations and after their District Manager Katarina from Seattle region promised to assist after GM told me to get the problem diagnosed at a local Buick Dealer, I was then handed off to a Rasheed in Customer Relations, who said Katarina had conveniently gone on a vacation for a week. Rasheed now told me GM won't pay for the repairs. SHAME on General Motors! This was a KNOWN problem (cheap, plastic materials used for their Intake Manifold Gaskets and a bad reaction between DexCool and the radiator) since 1996, according to embarrassing internal GM documents. And yet, GM still won't pay for my repairs. My extended family has been a long-time GM customer, purchasing Cadillacs, Buicks and GMC trucks in the past from them. Do you think we will EVER buy another GM product after such unethical, disrespectful treatment??? Not only should they pay for their obvious and court-documented MANUFACTURER DEFECT because it is the legal and ethical thing to do, they need to show respect to us as American taxpayers whose hard-earned money BAILED GM out of their bankruptcy in 2009. SHAME on you., General Motors. shame!
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2004 Buick Century- 3.1L V660,000
Replacing manifold gasket 1,000 dollars. Replacing entire engine in a car with only 60,000 miles when it died 60 days later 2,000 dollars. Buying a buick again? No way.
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1997 Buick Century277,684
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2005 Buick Century107,000
Intake Gasket replacement
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2004 Buick Century- 3.1L V6132,000
oil in antifreez
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its not fixed. There is no way I can afford $1000 to fix the darn thing and I sure as heck cant afford to buy another car. Thanks GMC ! GMC should have to some how right this wrong. I NEED MY CAR !
1994 Buick Century- 3.1L V6110,000
just got from older couple 2 month ago it has coolant leak and all so oil nothing to serious yet i keep stuff checked runs real good
Going to have intake problem repaired along with new antifreeze. Price quoted $550--six hours labor.
Collant leaking at rear of block between intake manifold and top of block between the lower part of the heads... slow at first then enough to trip the low coolant light... can't wait much longer to repair.
2002 Buick Century- 3.1L V672,000
leaking oil into the radiator
2003 Buick Century- 3.1L V633,000
When on highway for a while and then run into slow traffic or at idle for a while , temp gage would go up 3/4 way toward Hot. Had car at dealer for other problem and explained this to service writer and when they checked it out.
2002 Buick Century106,000
small coolant puddle under upper intake manifold(plenum)
1997 Buick Century155,000
I keep having to add coolant, but there is no leak. yet my dip stick is showing three to four quarts over full.
2003 Buick Century- 3.1L V633,000
After running on highway for a while then getting into traffic where I had to idle for a while temp gage would go up to 3/4 . Dealer repaired at no cost to me.
2002 Buick Century- 3.1L V6121,000
Same problem that everyone else is reporting. I noticed the smell of coolant after the car came in from a drive for a few weeks. I looked at the engine a noticed a quarter sized puddle of coolant on the block near the thermostat housing. Sure enough, the intake was leaking. My trusted mechanic charged me 800 to make the repair.
1998 Buick Century196,000
Gasket leak resulting in over heating,and burning coolant. Cost of repair was estimated at $1600. Car not worth fixing
replaced intake manifold gaskets
2000 Buick Century45,000
Repaired by replacing intake manifold gaskets -- $1200.00
2000 Buick Century105,000
low coolent light on also check engine light coolent on floor but when driving and thempure gage reads half way low coolent light goes off and no coolent will drip out
1998 Buick Century94,000
coolant is leaking
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