2006 dodge Dakota SLT 4.7 ltr engine. I hear clicking from under dash in 3 different locations when I change the temp from cold to hot, and change the dial from AC passenger position to Defrost. I read is either the blend door or actuator. Can anyone one tell me which one is when or all they all the pats the same? Blend door part and Mode actuator if there is such a part called that.

I know 2 are easy to get to from under drivers side under dash and one is located by glove box. are there others? this is not a duel climate truck