1Fitment: It is replacement for Skylark Temperature Blend Door Actuator 1991, replacement for Escalade Rear Auxiliary Heater Temperature Blend Door Actuator 1999, replacement for Astro Temperature Blend Door Actuator 1996?05. 2OE Number: The reference part number is 16124922, 604?100, 89018356, 1571845. Please confirm whether the model is suitable before buying. 3Temperature Control: Blend door actuator is used to adjust the temperature of the air, ambient humidity, cleanliness, exhaust air volume and wind frequency, etc. 4Direct Replacement: Replace the old or damaged original car heating controller, restore the normal operation of air conditioning, to give passengers a comfortable environment. 5Durable Material: This actuator is made of premium Abs material, which has high temperature and wear resistance, and is not easy to damage, to ensure long lasting durability.