Ok so I just went and checked the rear speakers in my ute. Seems I can only get bass sound coming from them, like having a sub woofer thats not a sub woofer. My climate control is the same too, has had the update but cold air at 25 and hot at 26.
I'd be interested to know if other VF Ute owners can get sound from rear speakers. It's hard to tell with the other cabin speakers working, I did not notice until I read the last post and went and stuck my ear right next to the rear speaker.