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If the rear defroster isn't working in your 2016 Ford F-150, start by checking the system's fuse. Since the defroster requires a lot of power, it's possible the fuse may have blown during regular use. If replacing the fuse doesn't fix the issue, inspect the wire traces on the window that generate heat to melt snow. Look for any damage to these wires. If everything appears intact, there may be an issue with the HVAC system affecting the defroster's functionality. Consider seeking professional diagnosis and repair if needed.
Please inspect the wiring and also make sure to check the tabs on the rear window as they may have become detached from it.
If the rear window defroster in your Ford F150 is not functioning properly, it is recommended to inspect the wiring for any issues.