Also, when I'm idle I hear it too and thats when I try to figure out the issue. I tripled check to make sure anything related to AC is off.
Originally Posted by KawiLex
Do you hear the motor closing the vent when you switch from outside air to recirculate?
I assume you aren't moving when the sound is occurring and also the engine is on. Could be a soundproofing leak coming from the engine compartment but these are just guesses.
You can still have air blowing through the vents if the fan is on.. even on the lowest setting. IS THE FAN ON???