Chevrolet 2004 Avalanche Owner's Manual page 363

Vehicles without Body-Side Cladding
2. Then go to the front of the vehicle and push left on
the secondary hood release, located under the front
emblem for vehicles with gray body–side cladding
or above the emblem for vehicles with no body–side
cladding.
3. Lift the hood.
Before closing the hood, be sure all filler caps are on
properly. Pull down the hood and close it firmly.
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