GM Service Manual Online
For 1990-2009 cars only
  1. You can use various methods in order to test for water leaks after the window adhesive has been allowed to dry.
  2. Use the watertest stands whenever possible in order to perform generalized testing.
  3. This method provides a large volume of water to a general area without going over the sealing limitations of the glass. Refer to Waterleak Test Preparation .

  4. Once you find the leak area locate the exact entry point using the Water Hose Test or Air Hose Test .