What are the Symptoms of a Bad Blend Door Actuator ?
An air blend door actuator is constructed from a plastic housing, a small electric motor, and a plastic gear set. A door position sensor is also incorporated into the unit to send feedback information to the climate control computer.
1, Clicking sound beneath the dashboard: A faint clicking or droning sound underneath the dash is usually a blend door actuator noise.
2, Knocking sound under the dash: Each time you notice a Knocking or tapping sound when you start your vehicle or turn on the HVAC system, it signifies an issue with the blend door actuator.
3, Wrong Temperature: Bad blend door actuators are mostly the cause of malfunctioning climate control systems.