Unfortunately, factory seat won't heat up if the outside temperature is over a certain point...not quite sure what's the cutoff temperature but it's in the mid to upper 50's (or higher).
That's why people would install resistors on the seat, to be able to crank up the heat even under higher outside temperature. It's a well known mod, easily found by searching this forum.
Aftermarket seats won't have that limitations, they will heat up under any temperature.
Sorry for hijacking the post....
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