There seems to be a whistling coming from the big black box onder the glove box. It definitley sounds like air rushing through something. If I press, or shift the box, it changes the noise. Where should I be looking for "leaks" Its really getting annoying. I cant really find where it is coming from except I know its under the glove box. It is not the normal 4th gen bearing noise of the blower motor- it is definately air escaping from somewhere. Any help?

 

ANY thoughts?

 

ISTR The blend doors at the heart of the climate control system are vacuum-actuated...