That is correct for my vehicles, they are self heating, you heat them yourself.
Depends on your manufacturer. Ones I have had started to heat when you turned them on and heated to the setting you set it at. Some might have a switch that over rides and activates only when you sit.
My JD lawnmower won’t start if my grandson wants to mow because of his weight.
My JD lawnmower won’t start if my grandson wants to mow because of his weight.