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Ya I've been curious about this on my SC as well. I can see the Celcius sign there when I shine a light into my dash, just have no idea how to change it..
on the 98-05's its an expensive module. even if u switch the climate control, it will still revert to whatever the car came with. dont even know what module, but i asked, and its expensive. maybe its different on other lexus's
when i looked into it way back for my 01 GS300 with NAV, i came to the conclusion to just leave it alone and get used to the F (it was either going to be too expensive to switch over or too complicated, no easy way was in sight)
then i moved down to california where the car came from and all is well again