Vehicle Questions and Answers
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It's likely that the issue with your Ford F-150's power sliding rear window not functioning stems from a defective switch or window motor. There seems to be considerable resistance between the gasket and the window glass, leading to increased friction that may hinder the motor's ability to move the glass smoothly. To potentially resolve this, try lubricating the entire channel with silicone spray or protectant to reduce friction and improve window operation. If applying lubricant doesn't solve the problem, pay attention to whether you can hear the motor running as you attempt to close the window. If the motor is audible, then the switch is likely the culprit.
It's probable that the issue with your Ford F-150's power sliding rear window not functioning stems from a defective switch or malfunctioning window motor.