1、Fitment: Heater blend door actuator is replacement for Blue Bird Vision School Bus 2004‑2019, replacement for Peterbilt 220 2008‑2019, replacement for Peterbilt 330 1995‑2019. 2、OE Number: Heater blend air door actuator replace part number are 604 5103, 00031247, 00063495, 00090191, 1696831 C1, 3020965, 317700, 324165BSM, 3543 H9635, 3685800 C1, 3947430, 3947439, 5X012834, etc. 3、Adjustment Function: Actuator can effectively adjust the air conditioning dampers to the set position, and can adjust the temperature of the gas in the car, ambient humidity, cleanliness, exhaust air volume and air frequency. 4、Comfortable Enjoyment: The stable performance of the actuator ensures a comfortable gas environment for passengers in a wide range of climates and standards. 5、Performance: Professional manufactured in accordance with strict quality control standards, and improved design to increase durability.