C3 Power window motor replacement?
Thread Starter
3rd Gear
Joined: Mar 2009
Posts: 3
Likes: 0
From: Arlington, Texas
C3 Power window motor replacement?
Does anyone know if there is a way to lock the window regulator spring to remove and replace the power window motor without removing the door glass and window regulator? I know the instructions are to remove the regulator and rotate to line up a hole to place a bolt in to lock the spring prior to removing the motor. It appears if one knew just where to drill a hole to place a bolt to lock the spring without removing the regulator, it would be simple to replace the motor and save all the labor of removing the glass and having to go through all the adjustment procedure.
Racer
Joined: Dec 2008
Posts: 308
Likes: 4
From: Matthews North Carolina
i replaced the pw motor on my 80 and did not have to remove the door glass or window regulator. see post http://forums.corvetteforum.com/c3-t...ment-pics.html
i did have trouble getting the teeth to line up exactly(3 bolt piece)- once i did this this, my new pw motor began working. good luck...
i did have trouble getting the teeth to line up exactly(3 bolt piece)- once i did this this, my new pw motor began working. good luck...
The ORIGINAL and bestest
Joined: Oct 2000
Posts: 10,009
Likes: 240
From: Toronto Ontario
Toronto Events Coordinator
Here is a picture of a driver's side door with the outer fiberglass skin removed. The hole to put the bolt through is the bigger one below the spring. In this picture, the window is not down quite far enough to get the bolt in, you can see part of the hole in the other part starting to show. You will have to feel for this hole since I don't think you will be removing the outer door skin! 
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
With the window 99% up ,put a couple plastic squeeze clamps on the glass,remove the motor,install new motor.
(If the teeth don't mesh,pull glass up the remaining 1% or lower it a tiny bit.)
(If the teeth don't mesh,pull glass up the remaining 1% or lower it a tiny bit.)
Race Director
Joined: Dec 2007
Posts: 14,345
Likes: 4
From: Hartselle AL
St. Jude Donor '09
Pulling the glass isn't that bad. Now, readjusting can sometimes be challenging. However, if you haven't pulled any of it apart, doing so lets you clean/update the nasty grease in the tracks.
Thread Starter
3rd Gear
Joined: Mar 2009
Posts: 3
Likes: 0
From: Arlington, Texas
Thanks to all for the responses and the pics. This is on a '77 drivers side door. It has a new window glass, new regulator, and new motor with all channels cleaned and new grease. Had it replaced while in the paint & body shop. The new motor (made in China), from a Corvette vendor, quit working after being actuated ten or twelve times. I have been through the challenges of adjusting the window and that is what I'm trying to avoid. I checked out the wiring for continuity and voltage. Then unplugged the new motor and plugged the connector to my old motor and it worked, but ran slow. I'm thinking that cleaning the old grease off and replacing with fresh grease on the original motor may make it work better. The new motor is under warranty and I'm sending it back for a replacement, but don't have a warm feeling about trusting it. Where was the motor from Pep boys made?
Thread Starter
3rd Gear
Joined: Mar 2009
Posts: 3
Likes: 0
From: Arlington, Texas
The motor quit working with the window all the way up. So as I understand it, plastic clamp the glass and remove the motor, that the up stops will prevent the regulator from moving.
