1Applicable Model: This Hvac blend door actuator is replacement for DeVille 2000?2005. Please confirm whether your model is suitable before buying. 2OE Number: The reference part number of the Hvac blend door actuator is 604?166, 89018380, and 52474878. And double check the part number of your item to ensure perfect fit. 3Practical Function: Effectively adjust the air conditioning damper to the set position, which can adjust the environmental humidity, cleanliness, exhaust air volume and wind frequency. 4Durable 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. 5Easy to Replace: Replace the old or damaged original car heating controller, restore the normal operation of air conditioning, to give passengers a comfortable environment.