Chevrolet 2008 Avalanche Owner's Manual page 168

Maintenance and Cleaning
To ensure that the water management system performs
properly, be sure that the Midgate
system are fully closed and that all parts are clean and
not blocked with debris. Follow the instructions given
next in this section for the proper procedures on cleaning
each item.
Top Drain Grates – Removal and
Cleaning
The top drain grates are located near the rear glass on
both sides of the vehicle. Clean the grates and drains
if there is a blockage.
2-86
®
, tailgate and cover
To remove each drain grate, do the following:
1. Remove the cargo panels or tonneau cover. See
Cargo Cover Panels on page 2-73 or Tonneau
Cover on page 2-90 for more information.
2. Grasp the edges of the grate and pull it out from
the vehicle. Flush the drain with clean water.