In my case, they were $108 for each seat. Basically, you:
- Raise the seat to it's highest position and tilt it back a little so you have room to work between the seat back and seat bottom.
- Remove the electrical connections and take the seat out of the car.
- Pressing down around the seat cushion, unhook the leather around the bottom of the seat.
- Slide whole bottom cusion off the seat frame.
- Unfold the cheesecloth-looking stuff from around the seat bottom.
- Using a flat screwdriver, remove the leather from the jute-type seat bottom by undoing the eight nylon clips (the clips are attached to long, thin metal bars that give the seat bottom it's shape at the seams).
- Once the leather cover is removed, turn it over and remove the heating element by unfolding the ends and sliding the two halves out of their little pockets. The heating elements for the thigh bolsters are attached to the main element but don't require any further explanation.
- Slide the new element into the pockets and remove the backing from the one sticky end that holds the wires and secure it into place.
- Fold the other three ends into the secondary sleeves.
- Put every back into place and enjoy the heat!
If there's enough interest in this, I would entertain the possibility of adding a more complete procedure, with pictures, under the DIY section on the home page of MercedesShop.
Dan