i just recently accuired a 1983 k5 and hit the switch to lower the rear window and it slowly went down and then back up i greased all the mechanical parts due to not knowing when the last time this was and it got to where the window was moving at a faster rate of speed untill it got to the top or bottom. the last time as i was putting the window up the window just stopped and now wont go up or down i can here the motor trying and the window moves about a 32nd of an inch but thats all nothing else can anyone help? i have looked and the window seems to be free of obstruction and looks to be on track. any sugestions.

 

Sounds like a weak motor.

 

thats what i was thinking but wasnt sure b/c it was moving so freely in the middle part of the operation now nothing

 

When the window engages the weatherstripping in the top, it will encounter resistance. With my manual rear window, there is more resistance at the bottom & top and is definitely easier to move in the middle.

You can verify by removing the cover off the inside of the tailgate and disconnecting the torque shaft from the motor. Hook it up to a drill and have at it. If the window moves with the drill, then the mechanism is working.

You may still need to lubricate the regulator assembly inside which may help the old motor, but probably not for long.

 

Thanks i will try that today if i get time