Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Remove the energy storage box (ESB) intermediate cover. Refer to Energy Storage Box (ESB) Trim Cover Replacement (5.3L Engine w/RPO HP2) .
IMPORTANT: Note the location and routing of the battery vent hose for ease of reassembly.
Disengage the retainers (3) securing the battery vent hose.
Disconnect the battery vent hose from the air duct hose (2).

Fig 1: View Of Battery Vent Hose & Retainers (5.3L Engine w/RPO HP2)

Courtesy of GENERAL MOTORS CORP.

Disconnect the battery vent hose from the batteries.
Remove all pieces of the battery vent hose assembly from the ESB that are required for service.