Try pressing the recirc button while its happening.I have a similar clicking noise (like grinding?) when the car is in idle with climate off. The noise is gone when in driving mode or turned off. I am typing this post while waiting for the technician to diagnose. The tech wants to compare my van with other hybrid to see if it is normal. Will update later.
Sorry guys, I’ve had no luck with this. It seems it needs parts or new software.