It is normal for the top of the range to be warm, or even hot to the touch when the oven is in use. There is a vent on the oven that vents steam and heat that can transfer to the cooktop surface. This is especially true if you have been baking or broiling for an extended period of time. Make sure this is not blocked on the cooktop.
If the surface is hot while using the burners, check the size of the pan being used. An oversized pan can trap heat between the bottom of the pan and the cooktop and transfer a lot of heat to the cooktop. Your pans should not hang over more than one inch on each side of any surface burner.