1. Check the fuse first if the heater is not working.
2. Remove facing and check landing of the left and right plugs of food supply to a heater of back glass if the fuse is in order. Clean the plugs if necessary.
If the heater still does not work, contact a specialist workshop.
If the heating filaments are broken, they can be restored using a conductive silver-based varnish, which is commercially available. To do this, clean the damaged area with a soft cloth.
3. Tape the damaged area A on both sides with adhesive tape B and apply conductive varnish C with a brush (see illustration).
4. Let the varnish dry for 24 hours at +25°C. If necessary, you can use a hairdryer. At a temperature of +150°C, the varnish dries in 30 minutes.
Attention! Do not turn on the rear window defroster until the varnish is dry. Do not use gasoline or other solvents on damaged thread.
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