Why is my 08' Lucerne filled with water?


Asked by Aug 27, 2014 at 10:49 AM about the 2008 Buick Lucerne CX

Question type: Maintenance & Repair

My 08' Lucerne has a water/liquid build up in the rear passenger floor and a new small
puddle on front drivers side. I haven't driven it for about four days, yesterday afternoon it
began building up condensation by the time the sun set the windows was covered with
condensation. This morning the windows are still covered and the entire interior is
moist/wet. Usually there are no signs of any leaks other than the puddles. When I
purchased the car last year the trunk/spare tire well was full of water, I removed a drain
plug and drained all of that but still get water back there. Oh yeah it smells really bad in
there! What in the world is going on?

8 Answers

Michael Kane

If it has a sunroof, the drains could be plugged up. Also did rain the 4 days the car was parked? You can take the car to a good detailer and get the carpets cleaned to get rid of the smell.

4 out of 4 people think this is helpful.

Thanks Michael, it does not have a sunroof. It hasn't rained here either. I have known about the water in the trunk from almost day one. The rear floorboard issue has been ongoing for a good while, I just didn't realize it was as bad as it is though. I first noticed the drivers side floor about a week ago. Maybe I have been "nose blind" but just recently noticed the smell. I love this car and usually drive it daily. I am now embarrassed by it and don't want anyone to ride in it.

1 out of 1 people think this is helpful.

Gaskets for rear tail lights leaked from the factory. This allowed water to collect in the trunk floor. Wouldn't affect front floorboard though.

2 out of 2 people think this is helpful.

Did u ever figure out what was causing the problem?? My lucerne does the same thing

1 out of 1 people think this is helpful.

Thanks chooch502. Soniapaiz, I never did find any answers for this problem. I finally just traded the Lucerne in for a new vehicle. I Checked the carfax on it (after I got rid of the car/ something I should have done before I purchased it) and now believe that my Lucerne may have been a Lemon buy back because it had WAY too many owners for an '08 vehicle also each owner only kept it for about a year or less. I do wish you luck with your Lucerne.


You must remove the back bumper to plug two holes behind it. GM used tape to plug these holes which obviously won't last. I've been dealing with this problem for a couple years now. I finally got to the bottom of it. Also, My front left and rear right floor boards are drenched!!!! But we've had a lot of rain. Today I blew the sunroof drains with a compressor They are located at the front corners of the sunroof. Open the roof and look in the front corners. On top of that, I opened up where the water drains. I found 8 years of build up of dirt, sand, leaves etc. It was piled up at about 4 inches high!! I'm willing to bet that there is build up at the drain exit. The drain exit is located at the back of the front wheel well. Unscrew the bolt at the bottom of the wheel well connected to the car. It's a small bold. Behind it you will find mass build up which is not allowing water to drain. I would have never found this if I hadn't gotten into a fender bender which opened up the plastic lining of the wheel well. Now that I have learned all of this today and have, maybe, solved the issue, my trunk won't open!!!! Ugggg.. I love this car but am not impressed with GM's quality of assembly. Best of luck!

2 out of 2 people think this is helpful.

Water in trunk repair with pics attached. Roughrider14 I used 2 rubber bicycle patches.

6 out of 6 people think this is helpful.

My 2008 Lucerne CXL (3800 engine) had the trunk leak after I owned it 2 years. Here's the fix. Vacuum out all the water after pulling the liner, carpet, spare tire, jack, etc from the spare well. Hang the liner and let it drip dry, then spray it with Wet /N Forget. Spray the (now dry) trunk itself with Wet 'N Forget. Pull both tail light assemblies clear and let them hang. Reach up from the bottom (I reached through the bumper brackets) and gently feel for a round rubber patch (one on each side). If the patch is even a little loose, use a good marine sealant (I recommend 3M 4200) to seal it completely around the edge of the seal. Reinstall spare 'tub', spare tire, jack, etc in the spare well. Reinstall the carpet, liner (this is the hard liner at the back, near the bumper), taillights, and cargo net. You should be good to go. If you want to test the fix before you put everything back in the trunk, open the trunk, and gently spray a garden hose (heavy mist) against the rear window. Watch the water travel down the water channels. Check for streams into the spare well.

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions


Looking for a Used Lucerne in your area?

CarGurus has 3,421 nationwide Lucerne listings starting at $1,988.


Search Buick Lucerne Questions

Buick Lucerne Experts

#1 seastorm709
Reputation 510
#2 DrakeTJ
Reputation 500
#2 jeffsbuick
Reputation 500
View All

Related Models For Sale

Used Buick LaCrosse"
402 Great Deals out of 18,435 listings starting at $1,200
Used Chevrolet Impala"
937 Great Deals out of 35,886 listings starting at $700
Used Buick Enclave"
547 Great Deals out of 20,868 listings starting at $6,750
Used Cadillac DTS"
86 Great Deals out of 1,911 listings starting at $1,995
Used Chevrolet Malibu"
1,182 Great Deals out of 72,976 listings starting at $695
Used Chrysler 300"
572 Great Deals out of 21,277 listings starting at $1,490
Used Cadillac CTS"
440 Great Deals out of 13,116 listings starting at $1,000
Used Dodge Charger"
683 Great Deals out of 30,340 listings starting at $1,995
Used Ford Taurus"
348 Great Deals out of 23,127 listings starting at $1,400
Used Toyota Avalon"
390 Great Deals out of 17,493 listings starting at $1,195
Used Nissan Altima"
1,491 Great Deals out of 88,087 listings starting at $1,195
Used Toyota Camry"
1,651 Great Deals out of 98,959 listings starting at $895
Used Nissan Maxima"
475 Great Deals out of 24,246 listings starting at $800

Used Cars For Sale

2011 Buick Lucerne CX For Sale
4 Great Deals out of 65 listings starting at $6,000
2009 Buick Lucerne CX For Sale
3 Great Deals out of 64 listings starting at $4,499
2008 Buick Lucerne CX For Sale
5 Great Deals out of 127 listings starting at $4,850
2007 Buick Lucerne CX For Sale
10 Great Deals out of 131 listings starting at $2,168