1Fitment: Heater blend door actuator is replacement for Rainier 2004?2007 Main Air Inlet Manual w/Rpo Code CJ3, replacement for Escalade 2002 Main Air Inlet Manual w/Rpo Code C60. 2OE Number: Ac heater blend door actuator replace part number are 604 120, 89018678, 89018373, 52474795, 15 73599. Please double check the OE part number of your item before ordering. 3Function: The blend door actuator is used to control your car's temperature control system, and can adjust the temperature of the gas in your car, ambient humidity, cleanliness, exhaust air volume and air frequency. 4Comfortable Enjoyment: Actuator ensure a comfortable gas environment for passengers even under a wide range of climates and standards. 5Shockproof: Ac air door actuator is made of durable Abs housing, anti vibration, durable, high hardness and high strength.