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OnStar Antenna leaking???

mntnbiker

New member
I have a 05 GP GT and when we have a torrential rain and the car is sitting in it, water leaks into the overhead map lights near the windshield. Anyone else have this problem? I'm thinking it might be the OnStar antenna leaking which is right above the map lights.
 


Yup common on our cars. Go to advance auto and buy water pump/thermostat gasket and layer some around the base if the antenna.Wipe off excess and allow to dry. You will be set then,this is what i did.
 
Yup common on our cars. Go to advance auto and buy water pump/thermostat gasket and layer some around the base if the antenna.Wipe off excess and allow to dry. You will be set then,this is what i did.

This! Common problem. Destroyed my headliner with water stains. Or use black rtv silicon.
 
yeah, my headliner looks like ass now becasue of leaking issue, took headliner down and sealed of rear on the front antennas. no leaks. And you will want to losten them up first.
 


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