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Senior Member
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Join Date: Aug 2018
Location: Ohio
Posts: 1,616
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Senior Member
Join Date: Aug 2018
Location: Ohio
Posts: 1,616
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It's been a while since I had my '88. One thing I used to do to clean the rear window was to run the window down, drop the tailgate, close both tailgate latches with a screwdriver, then CAREFULLY run the window up with the key, BUT NOT ALL THE WAY. So the latches both needed to be fully closed, as I recall. Also, the tailgate lock is "cammed" down by the regulator in some way, it's not a typical push-pull lock. As the window reaches the fully-down position, the lock is able to be pulled up, but not before. If you can't pull it up, the window (or at least the regulator) isn't fully down. Maybe when the window is most of the way down, you could get a thin piece of wood and 'help' the window go all the way down by pushing the glass downward, while using the key or while someone is pushing the switch. If you're ever able to get the tailgate to open, you can remove the inside cover and protective plastic, and maybe examine the regulator. You could also observe the movement if you're able to get that far. Maybe some foreign object inside the tailgate is preventing the regulator from going all the way down. Whatever you do, though, be careful not to break the glass, as it's nearly impossible to find nowadays.
On that truck, you have the tailgate latches, window position switch, key switch, and wipers on/off that all affect the operation of the tailgate window. Let us know if you get it figured out!
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