Where is the passenger compartment air filter located for a 2003 Chevy 2500HD pickup?

The 2003 Chevy 2500HD's passenger compartment air filter is located underneath the dashboard, on the passenger side. To access it, you'll likely need to remove a glove box liner or access panel. Precisely how to do this varies slightly depending on the trim level. Consulting your owner's manual is strongly recommended for the most accurate and detailed instructions specific to your vehicle.