I've placed cardboard flats under te seats at the opening if the vents so if any drainage of fluids comes out, it won't ruin my carpeting.
I can't afford to have the dash taken apart. He's under the seats in the lower vents. Not the dash.
same thin happened o a friends brother , and he spent $370 and they found nothing when removing the dash. So I'm not going to pay someone to tear my car apart, only to find nothing. And then my be able to put everything back together properly.