It gets crazy hot and cold here too and my Phoenix works just fine

. Fired right up at -3F this past weekend and has gotten hot as well. In a perfect world the non-nav conversion and a generic Android head unit that retains the stock A/C controls is the best way to go. I probably would have actually done that if my GX did not have the PX6 in it when I bought it. Unfortunately, the PX6 is really the only plug-and-play option for the nav-equipped GXs that I'm aware of, since the HVAC and infotainment are integrated. Lots of folks have done the non-nav conversion though.
The prints are Blue Dog. They did not come out perfect and there was a fair amount of fitting to get everything right - but more on me with trying to fit too many buttons in a small space and adding other items like the center-located GMRS external speaker (which vastly complicated things

. If i had to do it again I'd just get the Blue Dog transfer case switch surround with a Switch Pro mount to run accessories, which would have been a lot easier.
The phone holder is a
Panavise - their website is pretty old so I called them to order. They are great and I've had them on other vehicles too. You need both the vehicle-specific bracket an the generic AMPS mount for the phone.