Laurent, If you look at the picture of the inside, the motor has two pulleys. One pulley uses a 3 rib belt thru the idler (threads like a whirlpool, actually.) and around the drum. The other pulley runs a round belt (like a drive belt from a older Maytag dishwasher) up the back and drives the blower. The Halo of Heat is a system where the element is mounted in a mounting plate in the front of the dryer. As the dryer runs, the air is drawn across the element, thru holes in the front of the drum, thru the clothes and out the back thru the disc filter. The idea was that the heat entered the drum evenly all over as opposed to, say, a Whirlpool there the air passes thru a element 'can' and enters the drum in only one spot which may cause a 'hot spot'. This system has a few drawbacks. One is the dryer front getting very hot after long periods of drying. Another is that there is a felt seal glued to the front of the drum around the opening to keep things from falling in and shorting the element. This felt seal wears/burns away and coins, jewelry, etc falls in and shorts the element out. This brings us to the third issue. Servicing. You have to unhook wiring so you can remove the cabinette to access the element assy. Tip for the day: Good preventative care for a 06 or older model includes pulling the cabinette and checking the front felt seal and replacing it before damage is done.
RCD