Agreed, it sounds like the blend door actuator. I have replaced the actuator and the oscillation continues. This is a "dumb" servo that has motor, gears and the feedback potentiometer in it but no electronics or software. The electronics/software are in the car. The fact that you and others did not notice this noise until the vehicle software was changed is yet another indication that it is a software problem. The root cause of the oscillation is the timing in the electronics/software that are in the car and that timing and software may have been changed during your z11 repair. Replacing the actuator will not permanently solve the problem. I just recently have responded to a post by @Lightadjust2000 that he made yesterday.I brought my PacHy in 10/6. Because I had access to the Resource Guide from this forum, I emailed my repair rep the page detailing the Dealer to dos. While I have a rental, I did ask about loaners, they had none. Picked up the car on the 11th, all check points passed, battery replacement not needed. I did get the car back with a full tank & 3/4 charged and a coupon for a free wash locally. The Essential Care package from Chrysler comes 7 to 10 days post recall completion. I fully charged the car and haven’t used it until I returned to the Dealer today. Two days after fully charging, I retrieved an item thru the front passenger door. There was a rather low sound seeming to come from forward of the right side of the dash. Having never heard the sound before, I scheduled the return to the Dealer. If anybody recognizes the sound, please let me know. It’s not as loud as you hear, I amplified it. I could not attach the file, here’s the Dropbox link(thx if you check it out!):
PacHy sound rt fwd dash 2.m4a
Pumping or Gear turning noise while parked and plugged in. Post 127
In this post he mentions that after the dealer replaced the blend door servo actuator, "They said they had to Calibrate the replacement [blend door actuator] electronically in the firmware settings."Had the dealer fix my half baked attempt today. Charge out the door was $261. They said they had to Calibrate the replacement [blend door actuator] electronically in the firmware settings. Not sure if that was a bs comment or not.
If there are firmware settings that control the servo feedback gains or timing, these firmware settings may be the key to fixing the root cause of the blend door actuator oscillation problem. There is no doubt that the oscillation wears out the inexpensive actuator and makes the problem worse, but this ~$26 actuator is not the root cause; it is a symptom.
If somebody... anybody at FCA, Stellantis or anybody with knowledge of where and how to access these firmware settings would simply take the time to post on this forum, this nuisance problem could easily go away and not be such an irritation to so many Pacifica owners. If replacing this $26 actuator costs $261, surely a firmware setting would be a cheaper and much less invasive and unnecessary surgery on owners' dashboards.