Why does the base of my Sprinter's driver's seat get hot? While driving, all 4 sides of the white bottom part of the seat warm up and throw off lots of heat. If it's only 65 degrees out it gets so warm inside that I have to either open the windows or turn on the AC, and if it's over 90 degrees the white part gets so hot that I can barely hold my hand on it. It happens randomly, sometimes it doesn't happen at all, sometimes it starts warming up as soon as I start driving and sometimes it doesn't start warming until I've been driving for a few hours. I know there's a fuse box under there, so is there a short in one of the wires?