Pressure Relief Valve Replacement Utility

1. Open the lift gate.
2. Remove the outer quarter panel upper applique. Refer to Quarter Panel Upper Applique Replacement .
3. Remove the upper rear garnish molding. Refer to Rear Upper Garnish Molding Replacement .
4. Remove the corner rear garnish molding. Refer to Body Rear Corner Garnish Molding Replacement .



5. Depress the locking tab on the back of the pressure relief valve to remove from the rear of the vehicle.
6. Remove the pressure relief valve from the vehicle.

1. Install the pressure relief valve.
2. Press the pressure relief valve to fully seat.
3. Install the upper rear garnish molding. Refer to Body Rear Corner Garnish Molding Replacement .



4. Install the outer quarter panel upper applique.
5. Close the lift gate.

Pressure Relief Valve Replacement Avalanche/Esclade Ext

1. Lower the end gate.
2. Remove the rear compartment cover assembly(s).
3. Remove the cargo box bridge center panel. Refer to Cargo Box Bridge Cross Bar Replacement .
4. Remove the rear side drain duct deflector. Refer to Deflector Replacement - Body Side Rear Drain .
5. Remove the cargo box bridge side inner panel. Refer to Cargo Box Bridge Side Inner Panel Replacement .
6. Remove the cargo box bridge side outer panel. Refer to Cargo Box Bridge Side Outer Panel Replacement .



7. Using a flat-bladed tool, carefully pry the valve loose.

1. Install the pressure relief valve ensuring a snap fit.
2. Install the cargo box bridge side outer panel. Refer to Cargo Box Bridge Side Outer Panel Replacement .
3. Install the cargo box bridge side inner panel. Refer to Cargo Box Bridge Side Inner Panel Replacement .
4. Install the cargo box bridge center bar. Refer to Cargo Box Bridge Cross Bar Replacement .
5. Install the rear side drain duct deflector. Refer to Deflector Replacement - Body Side Rear Drain .
6. Replace the rear compartment assembly(s).
7. Close the end gate.