I just purchased a 1999 WJ with the 4.7 L engine and the ac was working fine. I went out today and noticed the ac is not blowing out of the ac vents but is coming out of the defroster vents and down below. Any idea what would cause this? There is a clicking sound that is coming from behind the controls.The dial to change where their comes out of doesn’t seem to make a difference. Any help will be appreciated.