Where is the vacuum lines on a 2004 Chevy Avalanche?

On a 2004 Chevy Avalanche, vacuum lines are typically located along the engine compartment, often connected to the intake manifold and various components like the brake booster and HVAC system. You can find them running from the engine to areas like the throttle body and around the firewall. If you're having trouble locating specific lines, referring to a repair manual or diagram for the vehicle can be helpful.