Finally found a download copy of the workshop manual for my truck. In a bit of luck, I had a $10 voucher on "evilbuy" so the download was free, bonus Now to look up the relevant section but I still think there'll be some kind of "tie in" with the rear unit causing grief.
Can only assume evilbuy = eBay
Another place you can look is called alldata since some auto part stores no longer sell manuals.
I don't know about "the best country in the world," but it's been my lifetime goal to go to Australia before I die!!!
........hummm, I better hurry up!!!
BTW, good luck on your A/C problems!!