Hey guys, I've been having this problem for some time now. When I turn on the heat, and push the button for the rear defogger. The light comes on, but the fog never goes away. I've used a test light to see if there is power to the back connecters. And it is, on both sides. I put the test light on the metal strip on the rear window and it has power. But it's still not working. I don't know what else to do. Any help would gladly be appreciated.