I have a 1990 Chevrolet Cavalier and my passenger side window has been broken since I got it. The glass is fine, but when I roll it down the window falls into the door. I put it back on it's track, but now it goes up and down and tilts like a teeter totter. How do I fix it? Should I just go to a repair shop?
The glass is not sitting on the shelf inside the door properly. Inside the door is a scissor jack with a rail for the glass to sit on. When the glass is not sitting on the rail properly it will slip out and fall in to the door cavity.
To fix this you will need to take apart the door. This is usually easier than it sounds. Once the door panel is off you will need to pull away the vapor barrier to get at the inside of the door and reseat the glass. You may need to warm up the adhesive that holds the vapor barrier in place with a hair dryer. Anything hotter and you may end up melting or shrinking the plastic.
You may need to tape the glass so that it stays in the up position while you realign and adjust the shelf that the glass sits on. Once the glass is seated and secure use some 3M spray adhesive to reapply the vapor barrier. Alternatively you can use Duct Seal as described in the second link.
Reassembly is the reverse of the disassembly process. Before putting on the door panel test that the window stays in place and does not hang up in the guide channels when rolling up and down.
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