2003 Chevrolet Avalanche Owner's Manual - Page 145

All-Weather Cargo Area Your vehicle has the ability to operate in many different configurations (cargo panels on or off, midgate up or down, rear glass in or out), allowing the cargo and passenger area to be open to the environment. To allow the vehicle to operate in these configurations, it is equipped with many different features to help it resist the elements and protect cargo inside the cargo area. Some of the features that help with this are the following: top drain grates, side rail channels, catch cups, midgate drain, cargo area floor drains and the rubber cargo mat. These are all part of the water management system, which is designed to quickly direct water out of the cargo box. Even when the water management system is working properly and the cover system is on, there may be some instances (heavy rains, automated car washes, etc.) when water may be present in the following areas: A. Top drain grates B. Removable front drain grate (Midgate drain gate) C. Side rail channels and catch cups D. Front drains E. Water drainage area (around both sides of the box and the tailgate side) F.Rear drains G. Cargofloor H. Cargo mat (central area of mat is intended to be dry) 2-72