For a number of years the only acceptable way to repair a windshield water leak was complete removal and reinstallation of the glass. The concern was potential rust development around the windshield frame, especially since the front and rear glass are structural components of the roof and add rigidity to an otherwise weak area. It was later discovered that water leaks are the result of a poor bond between the glass and the urethane, not the urethane to the frame. Consequently, in the early '90s General Motors issued a Technical Service Bulletin recommending that water leaks be repaired from inside the car.
Instructions
- 1
Sit inside the car and carefully fold the front headliner back in the general area where the water leak is located. Have an assistant slowly pour water over the windshield.
2Shine a flashlight onto the area where water starts to drip. Catch the water drips with a shop towel and continue to watch until the water stops. Thoroughly dry the area.
3Apply a small amount of silicone sealer to the exact point where the water is leaking. Use only enough to cover the area. Press the silicone into the hole with a wiping motion. Wipe several times across the area and apply another small amount of sealer. Do not apply excessive amounts of sealer.
4Test the repair after allowing the sealer to dry for two hours. Use a flashlight to verify that the leak has been fixed by having an assistant pour water over the windshield.
