I just replaced the cabin air filter and took the whole fan blower out. Just some moths and a couple leaves. Not bad for the first checkup in 3 and a half years.

The noise is still there behind the dash everytime I turn the AC off. It sounds like it is behind the passenger vent closest to the door. It is a clunk (sometimes more than one)... sometimes louder than others. After a second it is gone.

The AC works fine... it is just a noise. I have a warranty. Should I bring it in or leave it be? What would you do? Any thoughts on what the problem could be? A vacum line or shutter?