If you have the auto climate control, you'll need the expensive resistor.
One of the pics on the first page shows that particular resistor. My '06 EB had the same issue. I thought..."no big deal" went in to carquest, asked for it...they rang me up, said the total...I damned near **** my pants...WTF'nH..LOL.
Worth it to have air at all speeds, but son of a *****, it ought to come with a bit of vaseline..