Often, the park stops working on the rear window heating. You don't have to change the glass if there's a contact on the back of the glass to which the heating power is approaching. It can be glued. This will require: the glue that glue the central mirror to the windscreen, and the heat kit of the rear window-bottle of pasta and brush to restore damaged tracks (if the tracks are damaged).
In the warm room, degreasing the glass at the gluing place. Part of the contact that is adjacent to the glass, polish the surface to make the surface smooth and smooth, and also to degreasing. The mirror's glare is to be put on the instructions (attached) and glued to the contact. Wait until the glue is dry-time is specified in the instruction to glue. The next step is to miss three layers of contact with the heater and the heating threads.