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I'm having the same problem so took door panel off and saw that it runs on a cable system that is connected to a plastic spool which is turned by motor. I take the truck several times a year to Lake Havasu AZ which can get upwards of 120 deg in summer. My theory is temps inside the door heat the metal cable to temps much hotter and weaken the plastic so later when driving cable lets go of plastic spool and down comes window. Now has happened 3 times.

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16y ago
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Q: What causes ford f150 truck windows to go down at whim?
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