distribution doors not operating so airflow is only coming out the front lower floor vent and one port in the back seat. There is no defrost air or air from vents at driver or passenger level
How long has your 2002 Chevrolet Avalanche 1500 had this problem?
RepairPal Certified shops can diagnose and repair your 2002 Chevrolet Avalanche 1500. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
You may have a bad blend door actuator motor or flap. Some disassembly and diagnosis is needed.
Use this link to find a good shop near you.
https://repairpal.com/repair-shops
Alex