OnStar Antenna leaking???

**mntnbiker** · 01-28-2013

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.

**dmahlikGT** · 01-29-2013

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.

**REDCRAPGP** · 01-29-2013

Originally Posted by dmahlikGT

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.

**spazzz** · 01-29-2013

You definately want to loosen the antenna so you can get the silicone in the hole and under the gasket to seal it. Once I did that the problem was solved.
Grand Prixs Of North America • View topic - On-Star antenna Leak .... page shows how to get light out.

**jteske88** · 01-29-2013

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.