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It's under the passenger side of the dash.
The 2004 Chevrolet Silverado-2500HD has 16 valves.
The 2004 Chevrolet Silverado-1500 has 12 valves.
The 2004 Chevrolet Silverado-2500HD has a V8 engine.
The 2004 Chevrolet Silverado-1500 has a V6 engine.
The 2004 Chevrolet Silverado-2500HD is a gas-powered vehicle.
The 2004 Chevrolet Silverado-2500HD has overhead valves (OHV).
The 2004 Chevrolet Silverado-2500HD has a 5-speed manual.
The 2004 Chevrolet Silverado-1500 has overhead valves (OHV).
The 2004 Chevrolet Silverado-1500 is a gas-powered vehicle.
The 2004 Chevrolet Silverado-1500 has a 5-speed manual.
The 2004 Chevrolet Silverado 5.3 liter engine cabin air filter is located behind the dashboard, on the passenger side. The air filter can be accessed through the glove compartment.