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Robert R
Robert R, ASE Certified Master
Category: Dodge
Satisfied Customers: 4406
Experience:  Dodge Master Certified, Dodge Sprinter Certified
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I have had the same problem that many have had with the

Customer Question

I have had the same problem that many have had with the Blend door actuator/knocking sound. Replaced it and it broke within three weeks. Took it out and the plastic piece that controls the door was broken. Put another on one and watched what it was doing. It will change fine but it looks like it's trying to turn past the stoppers that are keeping it in place. Roughly at the 2 o'clock and 7 o'clock positions. It knocks against the top one like it wants to go past. Do I need to calibrate the part somehow or take it in to the dealer to have them do it. Or is it the blend door inside. It will switch from hot or cold until it knock on the top
Submitted: 9 months ago.
Category: Dodge
Expert:  Robert R replied 9 months ago.

Hello, welcome and thanks for asking your question. My name is*****'m a Certified Auto Technician with 29+ years experience. I will do my best to assist you. please keep in mind that I may need to ask questions of you before I can answer. When you reply please feel free to add as much detailed information as possible pertaining to your concern.

Yes, it is best to take it to the dealer. There is a routine in the factory scanner "HVAC Door Calibration" that will run all doors to their max travel and calibrate the positions in the HVAC controller for the hard stops.

This will make the A/C control learn the stops and help to save the actuators from breaking. Keep in mind that it IS normal for the actuators to try to go past the stop positions slightly. The way the HVAC Control learns the stops is by the current draw on the actuator motors. When the HVAC Control sees the increased current draw it turns off the actuator motor...

Keep me posted and let me know if you have any additional questions...

Thank you,


Customer: replied 9 months ago.
Awesome I'll take it in and let you know
Expert:  Robert R replied 9 months ago.

Sounds good...

Keep me posted and let me know if you have any additional questions...

Thank you,



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