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I have a 89 Bronco with same problem with mine. I have been told that it is probaby the window regulator. Mine was taken a part by a friend of mine and the motor seemed to work fine it just would stop half way down and not go up. If I pushed the button up and down it would take a while but it would go up again. I myself don't know what to do. If you get any info I would hope to get it passed to me.
A lot of people will recommend lubing the window tracks both in the tailgate and in the top before tearing into the regulator. Its sound advice. Also check for proper alignment of the tracks while you are at it. I had a similar problem after replacing the tailgate on my 92. Turned out I needed to adjust the striker posts because the tracks in the tailgate and the top didn't line up quite the same as they had with the old T-gate. If there is enough difference in the line of travel from the tailgate up into the top, it will cause a bind and, if severe enough, will stall the window.
Mine '89 did the same thing. When I opened the 'gate I found some of the material lining the window tracks had come out of the guides. WIth a little work I was able to "persuade" it back into place. What I noticed with mine was that the window would go down a ways and slightly **** and jam. If you repeatedly raised and lowered the glass it would eventually go all the way down. New tailgate is definately on the list!
I had the same problem and I fixed it yesterday. This is what I posted yesterday.
90% of you all probably already know this so I guess I'm talking to the other 10% of us who don't/didn't. My rear window has been giving me problems for the last 4 months. It would go down a few inches and it would get stuck. Then I would either have to rock the dash switch back and forth to get it to go down or go to the back and use the key with one hand and push down the window with the other---Very frustrating.
FIX:
1) First roll down the window, drop the gate and take off the inside panel (about 8 philips head screws) covering the tailgate. You will see pretty much nothing but glass after doing this.
2) Then manually flip the latches so you can use the key to roll the window back up. ***Very Important*** Put something under the window to support it--sawhorse, lawnmower or whatever. The weight of the glass could cause it to break when rolled up with the tailgate down.
3) After the glass is up you'll have access to the inside mechanisms. If you bend over and look at the underside you'll see a couple of arms that attach to two 6"-8" pieces of channel. These arms move along the channel to raise and lower the glass.
4) Get some good grease and smear inside both channels. You don't have to glob it in there just put enough that it goes completely on and along the inside of the channels.
5) Roll the glass back down.
6) Put your inside panel back on.
7) Pull your tailgate release handle one time to make your latches go back to the open position and close your tailgate.
8) Now roll up your window and see if it helped any. Mine goes up just as smooth as ever now. It doesn't slow down a bit.
Now this may not work for everyone but it sure worked on my rig.
Good Luck,
Brian
BTW, this took about 45 minutes start to finish.