Temperature blend door?

This is most always due to the blend door actuator has failed.

Here is a guide that will help with replacing this in general:

https://www.2carpros.com/articles/replace-blend-door-motor

The thumping noise that you are hearing is the actuator trying to move to the proper place. So unfortunately the only correction is to replace it.

Here is a video that will help as well but it is basically the same info:

https://youtu.be/tY6M92fA2ug

Below is the process from the manual that will help with the remaining detail needed to replace it.

Please let us know what questions you have with this.

Thanks