Sound Of Air Flow Mode Changes

[hmkim]

I have a '06 ES330. Today I noticed that when I pressed the "MODE" button to

change the air flow mode, some kind of motor sound was audible. I don't know

if the air flow mode change always made that sound or if it recently became

loud enough for me to notice. It sounds similar to the sound you hear when

you change CDs.

So, I wonder if other Lexus cars make a similar sound...