No. 1 Insufficient Air (Or No Air) Blown From Vents
WARNING: This page is about a different car, the 2003 Mazda Protege5 and 2003 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Troubleshooting Item Description Chart
Courtesy of MAZDA MOTORS CORP.
Fig 2: Diagnostic Procedure Chart - Insufficient Air (Or No Air) Blown From Vents