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Water leak from cabin interior roof light

5 messages,  Last post on Aug 19, 2009 at 5:07 AM

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#1 of 5 Water leak from cabin interior roof light by lacrossesoaked 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. Replies to this message: lacrossesoaked (Nov 08, 2008 6:06 pm)
#3 of 5 Re: Water leak from cabin interior roof light [lacrossesoaked] by lacrossesoaked Nov 08, 2008 (6:06 pm)
Replying to: lacrossesoaked (Nov 08, 2008 8:50 am) 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 5 Water leaking from the roof by dthayer 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. Replies to this message: lacrossesoaked (Aug 19, 2009 5:07 am)
#5 of 5 Re: Water leaking from the roof [dthayer] by lacrossesoaked Aug 19, 2009 (5:07 am)
Replying to: dthayer (Aug 19, 2009 2:43 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 !

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