Part Type: HVAC Recirculation Door Actuator. 1991 Chevrolet K3500. 1992 Chevrolet K3500. 1994 Chevrolet K3500. 1993 Chevrolet K3500. HVAC Air Door Actuator. Air Door Actuator. Ensure that this part fits your vehicle by entering your vehicle's Year, Make, Model, Trim, and Engine in the Compatibility Table.