OE/OEM Part Number 10397365, 604-188. Interchange Part Number 10397365. 1x HVAC AC Heater Blend Door Actuator. What is a Blend Door Actuator?. 3 Signs of a Failing Blend Door Actuator. If you've noticed that the air coming out isn't flowing as fast as it should be, but then picking back up later, you're having inconsistencies, and this is a big sign that your blend door actuator is failing quickly.
