Plugged Drain Hose
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
If a waterleak has occurred check for a plugged drain hose at each corner of drainage system.
- Open the sunroof window.
- To test for blockage, pour a small container of water into the module housing drain trough. Check each corner to confirm the drain hose is draining water.
- Use compressed air, 241 kPa (35 psi) or less to blow out any drain hose that is plugged.
- Test the system again.
- If the hose remains plugged, check to see it is properly routed and does not have a kink. Refer to Sunroof Housing Front Drain Hose Replacement , or Sunroof Housing Rear Drain Hose Replacement (Avalanche) , Sunroof Housing Rear Drain Hose Replacement (Escalade) , Sunroof Housing Rear Drain Hose Replacement (Yukon XL/Denali/Suburban) , Sunroof Housing Rear Drain Hose Replacement (Yukon/Tahoe Short Utility) .
- Remove the blockage using the following steps.
- Push mechanics wire through the hose to remove the obstruction.
- Use compressed air in order to blow out any remaining material.
WARNING:
Wear safety glasses in order to avoid eye damage.