I have a duel zone climate control head unit that I bought used.It is out of a 2006. I thought I could use it in my 2005 Pacifica that came with just a standard control, not zoned. It turns out that you can't convert an unzoned system to a zoned. The wiring was different.I'll send photos if you are interested.
It is yours for $75, or make an offer. Let me know.
Alan