Okay, first it was a whiny AC now I'm noticing a dripping sound in the rear. My 08 fx4 is brand new, and all this is quite unpleasant to hear. Anywho, I only hear the dripping noise after I turn off the truck, and it lasts for a couple minutes (haven't timed it to be exact)

What exactly is this noise, and how do I fix it?

 

Converter heat shields make a noise like that when they are cooling off.