Because nothing in my world is easy, last night the rear left window on the newly resurrected Liberty decided not to go back up. It was dark out, but I pulled off the trim and lifted the window back into place to prevent the interior from freezing over, then went inside to pout. As I started looking on rockauto for a replacement regulator, I had this memory that I'd done this repair before... sure enough, in 2016 I bought a regulator for the same window. Given I put less than 300 miles on the car in the dead of winter before I parked it, it seemed unlikely even a cheapo regulator could have failed in that time.
This morning in the light I took another look. The issue is NOT the regulator. It still goes up and down just fine. The issue turns out to be how the glass attaches to the regulator.... There is a sheet metal bracket at the bottom of the glass with a single ball joint that engages the regulator and is secured with a little clip. My issue is that the sheet metal bracket bent, forcing the ball joint out of the clip. The window could go down as it just rode the regulator down, but couldn't go up because the regulator would jam against the window glass.
I bent the sheet metal bracket back into shape, the ball joint re-engaged the regulator easily, and the clip went right back into place.... now the window works again.
It seems the issue occurs when the window switch is held in the UP position too long - the motor will over time re-bend that sheet metal bracket and the ball joint will disengage. Probably, eventually, the sheet metal bracket just fails.
I read *somewhere* that the master window control in the center console provides a (current?) limiting function to prevent this from happening. The implication here being my regulator is fine and my switch is bad. Does anyone know anything about this? I can't be the first person to have this issue!