Buy OEM 2003 Gmc Part # 13508023 (13356916, 23456097). Cabin Air Filter. Cabin Air Filter - Repair or Replace If the air coming out of your vents smells a little funny—like mildew or funk—or

Cabin Air Filter. Filter - Passenger COMPT Air.
Cabin Air Filter. Dust and Pollen Filter. Included with: Air inlet, Air inlet assembly.

Cabin Air Filter CoverHVAC Blower Motor Housing BracketCabin Air Filter

Cabin Air Filter - Repair or Replace
If the air coming out of your vents smells a little funny—like mildew or funk—or if your windshield fogs up with the A/C on, your 2003 GMC may have a clogged cabin filter. Many manufacturers recommend replacing the cabin filter, or pollen filter, as part of its scheduled maintenance.