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Fix for Leaking OnStar Antenna?


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We we had some strong storms roll throught the DFW area yesterday for a while. When I finally got out to my truck, there was a nice puddle of water sitting in my All Weather floormat. Now I know why GM sells these - to keep your carpet dry from the leaky roof! There was several ounces of water down there = a large puddle. I traced it up the inside of the dash, up the A-pillar, and to a wet headliner. NOT HAPPY!!!

 

This is the second time this has happened in my new truck. The first time was a few months ago and only a little amount, so I thought it might have been a fluke. Though I did bring it to the dealership to have them look at it. They spent at least an hour in the water bay, most of the time with me helping, trying to find a leak. They first suspected the sunroof drain, but rulled that out after several tests. Then looked around the front window, but couldn't find anything. But the window couldn't be the cause with the location of the wetness in the headliner without a strong headwind (like while driving). Both occurences have been while parked at work for a long period of time. Then I mentioned reading some issues with the OnStar antenna, so they ran a strong hose right up on it for several minutes - nothing. I told them I'd keep an eye on it and come back. Obviously it wasn't a fluke, and obviously there's a problem.

 

Does anybody know what's going on? Why is there a gap in the OnStar antenna seal? For those that have had this fixed, did the dealership do anything different than just replace the antenna? Is there a new/better antenna design? Did they apply additional sealant? Is GM doing anything to address this? Has anyone applied sealant to the gap to fix this problem themselves?

 

When they were looking for my leak, the did partially drop the headliner to inspect the underside of the roof. The antenna was installed tightly. I'm just curious if anybody knows what the real problem is? Or what the real fix is?

 

Thanks.

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  • 2 weeks later...

We we had some strong storms roll throught the DFW area yesterday for a while. When I finally got out to my truck, there was a nice puddle of water sitting in my All Weather floormat. Now I know why GM sells these - to keep your carpet dry from the leaky roof! There was several ounces of water down there = a large puddle. I traced it up the inside of the dash, up the A-pillar, and to a wet headliner. NOT HAPPY!!!

 

This is the second time this has happened in my new truck. The first time was a few months ago and only a little amount, so I thought it might have been a fluke. Though I did bring it to the dealership to have them look at it. They spent at least an hour in the water bay, most of the time with me helping, trying to find a leak. They first suspected the sunroof drain, but rulled that out after several tests. Then looked around the front window, but couldn't find anything. But the window couldn't be the cause with the location of the wetness in the headliner without a strong headwind (like while driving). Both occurences have been while parked at work for a long period of time. Then I mentioned reading some issues with the OnStar antenna, so they ran a strong hose right up on it for several minutes - nothing. I told them I'd keep an eye on it and come back. Obviously it wasn't a fluke, and obviously there's a problem.

 

Does anybody know what's going on? Why is there a gap in the OnStar antenna seal? For those that have had this fixed, did the dealership do anything different than just replace the antenna? Is there a new/better antenna design? Did they apply additional sealant? Is GM doing anything to address this? Has anyone applied sealant to the gap to fix this problem themselves?

 

When they were looking for my leak, the did partially drop the headliner to inspect the underside of the roof. The antenna was installed tightly. I'm just curious if anybody knows what the real problem is? Or what the real fix is?

 

Thanks.

They installed a new seal and applied sealant when they fixed mine. The second time I had a leak it was the steering shaft seal in the firewall.

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I work for a autoglass company and we do the glass work for a local Chevy dealership. In the past 8 months we have had at least 15 cases of water puddling on driverside floor. In every case there was a tiny spot on the driverside top corner where the urethane adhesive wasn't touching the pinchweld. So under heave rain or high pressure, water would work its way in and collect on the headliner and either run down the a piller onto the floor or drip out the overhead console.

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  • 5 years later...
On 7/9/2014 at 3:46 PM, Tamadrummer74 said:

I work for a autoglass company and we do the glass work for a local Chevy dealership. In the past 8 months we have had at least 15 cases of water puddling on driverside floor. In every case there was a tiny spot on the driverside top corner where the urethane adhesive wasn't touching the pinchweld. So under heave rain or high pressure, water would work its way in and collect on the headliner and either run down the a piller onto the floor or drip out the overhead console.

Hey tamadrummer, where exactly is this spot? I’m having the same problem and need to fix it 

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