01 buick century-water leak mystery

Posted in the Buick Century Forum

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bruce

Santa Ana, CA

#1 Feb 11, 2007
I have a water leak coming from what i thought was the thermostat housing so I replaced the gasket but am still getting a slow leak in that area. It looks to be coming from about a half inch away toward the direction of the block. Any ideas?
Dan

Collierville, TN

#2 Feb 12, 2007
I think I have the same leak, I think it is the intake manifold gasket. I also have slime in the coolant which I think is motor oil getting into the cooling system also because of the intake gasket.
Whitney

Okmulgee, OK

#3 Apr 26, 2007
I have a water leak and so I replaced the intake gastet and i have no problem
ragingbender

Grand Rapids, MI

#4 May 20, 2007
bruce wrote:
I have a water leak coming from what i thought was the thermostat housing so I replaced the gasket but am still getting a slow leak in that area. It looks to be coming from about a half inch away toward the direction of the block. Any ideas?
Intake manifolds are quite common in the 3100 and 3800 series engines. Though less serious in the 3100, the 3800 will actually hydraulically lock and stall the engine. Of course, when you try to restart the engine, the starter blows off the car. have the intake manifold gasket replaced soon or you will have serious problems. they usually last upwards of 100000 miles, so most people only have to do it once. Just be glad you dont have a Lesabre.
johntbear

Brunswick, ME

#5 Jul 9, 2007
I have a water coming into the passenger side of my 2000 Buick Century when it rains. I went to the dealer but no reports of any problems. Any ideas before I start taking the car apart?
mgarlitz

Annapolis, MD

#6 Dec 13, 2007
Did you ever find your problem? I have the same problem.
Steve

Dearborn, MI

#7 Feb 29, 2008
I just took my 03 Century to the dealer and they drilled a hole in the bottom of the cabin air filter box and installed a drain tube. I had water leaking into the passenger floorboard when it rained, its due to the plastic on that side not sealing to the windshield area and thus running into the cabin air filter box.
sepins

Collierville, TN

#8 Dec 10, 2008
Steve wrote:
I just took my 03 Century to the dealer and they drilled a hole in the bottom of the cabin air filter box and installed a drain tube. I had water leaking into the passenger floorboard when it rained, its due to the plastic on that side not sealing to the windshield area and thus running into the cabin air filter box.
I have the same problem on my 1999 century and also on 99 regal the 2001 also leaks. Buick says they have never had a complaint. This is bull. We have complained since 2003 after we had to keave one of the cars outside in the rain. We still complain. I am fiving to look into the drain hose thing that I read about. Also, the vent resealing. Looks like it is coming directly from the vent???????
Jim
Jody

Center Ossipee, NH

#9 Apr 30, 2009
I have a 2001 Buick Century and I have this same problem. But now this problem has created more problems! First there was water on the passenger side floor, then the blower for the heater /air conditioner stayed on when car was shut off! Drained battery as I did not notice the first time. Slowly blower motor stopped working all together. Now windshield wipers are stuck in vertical position. Has anyone had any luck with Buick addressing this problem? Any luck fixing the problems?
Jody

Lewiston, ME

#10 May 1, 2009
Steve wrote:
I just took my 03 Century to the dealer and they drilled a hole in the bottom of the cabin air filter box and installed a drain tube. I had water leaking into the passenger floorboard when it rained, its due to the plastic on that side not sealing to the windshield area and thus running into the cabin air filter box.
I have the same problem with my 2002 Buick Century. When it rains I get about an inch of water only on the passenger side floor. I believe it also lead to problems with my heater/a/c blower. First it strated running when the car was off! And then the blower only worked on high and then not at all. Now I also have windshield wipers stuck in the horizontal position.
Were you able to find the source of the problem or get anyway with Buick? I have seem on other forums that these problems ar very common.
Lori

Kingston, PA

#11 May 26, 2009
I have the same problem and was wondering what it could be. So glad to see it happened to more than one so I have a clue how to fix it.
Brendan

Palmetto, FL

#12 Jul 11, 2009
I have a 97 Buick century and I have the same problem with the water leaking. I'm not sure exactly why, also my AC only works on high now, in addition it makes a clicking noise. I think for the AC i need to replace the blower motor resistor. And for the leak i will be messing with it, trying to figure out why, i have already tried a few things but now i think its something with the AC being clogged and it backs up into the car, i will look into it more tomorrow.

Also is it just me since i live in Florida, but do your window regulators break, I have had to replace all 4 and one twice! I think it is a combination of the heat and poor construction.
Dale

Niagara Falls, NY

#13 Aug 9, 2009
I THINK I FIXED IT!!!

OK, my 99 Century also had water coming in on the passenger floor board, and the blower stuck on HI.

I removed the black plastic panel that covers the Cabin Air Filter. see this link for instructions: http://www.micronair.us/assets/pdfs/60.pdf

The pictures on the instructions aren't very detailed, and there was one flat tip screw, and two pop up plug fasteners.(you raise the inner core 1/2 and inch, and then the outer core comes out)

Anyway, when I removed the panel, I noticed that there was a 2 foot long rubber seal that was not in place. It needs to be seated along the bottom edge of the metal frame, to block the water that runs off the windshield.(I re-seated it with RTV silicone sealant).

I cleaned the filter while I was at it, and re-installed everything.

That 2 foot seal was the culprit, as water would run down from the windshield and fall directly on the filter element.

Hope this helps the next guy or gal.

Dale
Brendan

Saint Petersburg, FL

#14 Aug 9, 2009
That is exactly what i did also, have not had water in my car in the past month or two. I forgot to post this though.
Lance

Hartville, MO

#15 Sep 14, 2009
I have a problem with my 2002 Buick Lesabre leaking water onto the floorboard on the driver and passenger side. I noticed when I opened the door I could see a small stream that would go across the bottom of the doorjam. This happens everytime it rains. Sometimes it's dry, most of the time it's wet. I now have a probem with water on the floor on the rear passenger side behing the driver. I've been placing towels across the doorjam before I know it's going to rain. I love the car though. Please help!
Dale from Buffalo

Philadelphia, PA

#16 Dec 15, 2009
Genius! My 01 century had the exact problem you described! I glued that molding back in place and can't wait till it rains again! Thanks
Steve

Philadelphia, PA

#17 Dec 15, 2009
Dale from Buffalo you are a Genius! My 01 century had the exact problem you described! I glued that molding back in place and can't wait till it rains again! Thanks
Larry In VA

United States

#18 Dec 25, 2009
I have the exact same problem on my 2001. Just started this fall.
John

Bowling Green, KY

#19 Dec 31, 2009
Thanks Dale. Funny, but I saw another post today on another site and comment was "this started happening after having my car serviced at Jiffy Lube. THIS IS EXACTLY WHAT HAPPENED TO ME A COUPLE OF YEARS AGO LIKE A FEW DAYS LATER. Just today, I woke up to another passenger floorboard full of water and had the day off, so wanted to fix it.

When I pulled off the cowling, I saw the 2 foot rubber seal sitting down in the compartment next to the filter. Obviously the lugnut that changed the filter last didn't put the rubber seal with the water drain track in it back properly. My auto parts guy figured out that after the seal is placed back on the engine compartment edge - directly over the filter box - you also must place the plastic grill with the top edge up on the rubber seal. He said this will help keep the seal from falling off - nice catch!!!

I think I'll give this fix a few weeks, then try the RTV rubber sealant if it is still leaking.

Funny how such a pain problem is easily corrected.
John

Bowling Green, KY

#20 Dec 31, 2009
P.S. If you like at photo #4 in link above in Dale's 8/9/09 posting, you can see exactly where the 2 foot rubber seal should be placed. It is in the top half of the photo on the edge of the compartment directly over the filter/box. The water will then come off the windshield, around the filter area and out the drain holes, NOT INTO THE PASSENGER FLOORBOARD!!!

Thanks again, Dale and my auto parts guy.

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