GM Service Manual Online
For 1990-2009 cars only

A drain trough encircles the sliding window panel and leads to the drain hoses. The drain hoses are located at each corner of the assembly. The two front drain hoses route down the windshield pillars. The two rear drain hoses route down the rear sail and the quarter panels.

If you encounter a wet headliner or other water leak, inspect the following areas for the source of the leak:

    • The windshield
    • The rear window

Verify that the drainage system is not plugged or restricted. Use the following procedure:

  1. Using a one pint container, pour water into the drain trough with the sunroof open.
  2. Inspect for water drainage through exiting the front and rear wheelhouse areas.
  3. If the water flow is restricted, use a low volume of compressed air in order to clear the drain system. Do not blow the drain hose away from the housing drain spouts.
  4. Retest the system.

If water drips from the headliner above the door, lower the headliner as required in order to inspect for a proper drain hose connections. If necessary, install new tie wraps onto the housing assembly drain spouts.