Used to have that as well...never did figure it out and it went away by itself. Double check that the lower dash panel is secured...I think mine had something to do with me forgetting to put the screws back in...
Had this problem in my 05 Hemi. Dealer said it was my trailer brake harness. They tied it up better and I had it still till the day I sold the truck. I don't think it was A/C related. Never did figure out what it was.
My opinion it is probably a panel fitment problem. Don't spend your life chasing it down though.
I have a 06 as well and I have a ticking noise that sounds like it is under the dash and comes on when I am pressing the gas pedal and when I let off it goes away.... I am pretty sure it has done it for a while.... never have bothered to figure out what it is..?
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