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Buick LaCrosse, Sedan
#1 of 18 Water leak from cabin interior roof light
Nov 08, 2008 (8:50 am)
Water is dripping from the cabin light of my 2005 Buick LaCrosse.
this is the cabin light located in the middle of the front seats between the driver and passenger seats. Lots of rain today and the car was parked for about 45 minutes nose pointed downhill during the downpour. Then when I started to drive it, I noticed the dripping. Just 8 good sized drips and then it stopped. When I got home, I opened/closed the sunroof; checked the drain channel , pretty much dry, no debris so I doubt if that is where the water got it. HOWEVER, located directly about the cabin light in question is where the OnStar antenna is mounted atop the car. I dried all the water off around the antenna base then applied some medium to light downward pressure----water bubbled out from under the base. I am thinking that this is where the water is getting in---a faulty seal or something? Anyone else had this problem? This is the second water leak we have had with this vehicle and this one is probably not going to be covered by warranty. I am not happy. Thanks for your help.
#3 of 18 Re: Water leak from cabin interior roof light [lacrossesoaked]
Nov 08, 2008 (6:06 pm)
I was able to fix this today. For anyone who needs to access the base of their OnStar antenna (on the interior side of the roof), here is how: pop the covers of the overhead cabin light by pulling down on each end of the plastic cover, the side which meets the middle border between the two plastic covers (lenses). The covers should come off with very little effort. Once the interior of the light cabinet is exposed, take out the two screws which are readily accessible. Then on the opposite end from the screws, pull down from each side of the plastic housing. The housing should pop out with minimal effort. The antenna retaining assembly should now be accessible.
I loosened the bolt which screws into the base of the antenna so that I could look under the exterior antenna mounting; discovered distinctive pattern of dirt residue leading me to believe small amounts of water have been invading for some time. I cleaned it up, applied a small amount of silicon sealer under the mount base, tightened the bolt and put the light assembly back together.
#4 of 18 Water leaking from the roof
Aug 19, 2009 (2:43 am)
I also have water leaking through the lights. I couldn't tell if it was coming from the antenna or the moon roof or how to go about fixing it but will now check both based on the info given.
#5 of 18 Re: Water leaking from the roof [dthayer]
Aug 19, 2009 (5:07 am)
since I re-sealed the antenna almost a year ago, no further water problem. as a suggestion, once you take the light lenses off and have visual access to the bottom of the antenna, do a water test prior to messing with it. maybe simulate a driving situation whereby someone uses a garden hose to spray water at the antenna base while you observe from inside. good luck !
#6 of 18 Re: Water leak from cabin interior roof light [lacrossesoaked]
Mar 24, 2010 (2:34 pm)
I am wondering if your instructions are for a car equipped with or without a power sunroof. I am asking because I followed your directions but once I removed the plastic covers and then the 2 screws, I could not remove the plastic housing. It did come loose where I removed the screws, but not the other end. It seemed to be connected to the sunroof button somehow but couldn't see how to remove. I didn't want to break it off. Can not see what is holding this on. This is why I ask if you had a power sunroof. Any suggestions as to what I am doing wrong as I need to fix this leak.
Thank you very much.
#7 of 18 Re: Water leak from cabin interior roof light [lwrobel]
Mar 24, 2010 (4:48 pm)
Yes, I do have a power sunroof. I did not have a problem in removing the plastic housing once I had removed the two screws.
#8 of 18 Re: Water leak from cabin interior roof light [lacrossesoaked]
Mar 25, 2010 (6:33 am)
Thank you so much for your quick reply. Do you have any insight you can add. As stated when I removed the 2 screws, that end of the housing easily came loose but the other end where the power sunroof button is was attached very tightly. When I tried to gently remove it by pulling that end, it did not want to budge and I don't want to break anything. Do you know if it is snapped or clipped in by the power button end. In other words, if I use some gentle force, will it snap off? I don't want to make matters worse. Any additional advice, details or experience you can add would be greatly appreciated. !!! THANK YOU
#9 of 18 Re: Water leak from cabin interior roof light [lwrobel]
Mar 25, 2010 (8:31 am)
What I know for sure is: when I removed the two screws, all I did was apply alternating pressure on each end of the panel; wiggle while pulling down; and it came free.
I suspect the power button is connected to the panel by wires with a clip. I kind of remember that after I removed the panel, it just was suspended, probably hanging by the wires to the power button, while I did my inspection/repair.
I do remember that once I had those two screws out, the rest was EASY so it could not have involved anything technical.
Let me know how it turns out for you.
#10 of 18 Re: Water leak from cabin interior roof light [lacrossesoaked]
Mar 29, 2010 (7:07 am)
THANK YOU!!! I think I fixed the problem. It poured last night and no leaks!!! Thanks for your instructions-had I not found this I probably would have paid a mechanic a couple of hundred dollars to fix something pretty simple. ))