Check the fuse: The first thing you should check is the fuse for the rear window demister. It is usually located in the fuse box, which is typically under the dashboard or in the engine bay. If the fuse is blown, replace it with a new one of the same amperage.
Inspect the wiring: If the fuse is intact, the next step is to inspect the wiring for any damage or loose connections. Check the wires that connect the demister heating element to the fuse box. If you find any damaged or disconnected wires, repair or reconnect them accordingly.
Test the demister switch: The demister switch is usually located on the dashboard. Press the switch to turn on the demister and see if it is working properly. If the demister does not turn on, check the connections of the switch and the wiring.
Replace the heating element: If the fuse, wiring, and switch are all in good condition, the problem may be with the heating element itself. The heating element is embedded in the rear window, and if it is damaged, the demister will not work. To replace the heating element, you will need to remove the rear window and install a new heating element.
It's important to note that if the rear window demister is not working, it is recommended to have it repaired as soon as possible to ensure good visibility and safety while driving in foggy or frosty conditions. If you are not comfortable performing these tasks yourself, it is best to consult with a qualified mechanic or auto electrician.
