Evap box is usually right above the spare tire, in a nice little area all its own. Hard to miss.
I got an 06 and the evap can is a black box-shape located by the feul tank...easy to replace.
next to the right side head light
The evaporative emission (EVAP) canister vent solenoid in a 2004 Avalanche is typically located near the EVAP canister, which is usually positioned under the vehicle near the fuel tank. You can consult the vehicle's service manual for more specific information on its exact location.
behind the rear passenger tire
The evap canister is commonly located under the vehicle close to the fuel tank filler pipe. The canister helps to store vapors from the fuel tank.
The evap canister is located under the vehicle close to the fuel tank. The canister is charcoal filled and holds fumes from the tank.
The evap cannister is located underneath the vehicle in front of the fuel tank.
The EVAP Canister is located under the front passenger door.
The EVAP canister on a 1996 Chevrolet Lumina is located under the rear of the vehicle. The spare tire has to be removed to reach it.
The EVAP Canister is located under the Vehicle, mounted to the left frame rail, ahead of the fuel tank. It has hoses attached to it,
The evap canister on the 2003 Trailblazer is located on a bracket near the fuel tank and is almost touching the under-body of the vehicle.
The EVAP canister is located underneath the vehicle, on the driver's side, just behind where the front seat is located. It is a black plastic box with hoses and an electrical connection.