C4 Window adjustments ?????
Melting Slicks
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
Vernon: The adjustment sounds more complex than it really is 
. I assume the door is not sagging and the hinges do not require adjustment. You first post indicates you just replaced the w'stripping on the door. There are two adustment that allow the door to fit the weatherstripping.
The first and easiest adjustment is the height or location where the window stops going up (and down). This location where the window stops can be modified by moving some stops. To determine if this is the adjustment that is needed, do the following:
1. let someone sit in the car and let the window down two or three inches from the top. Do this with the door open. Then close the door. Have the person in the car raise the window up until it stops. The main reference point is to check the read edge of the window to see if it is parallel to the edge of the roof of the car.....and the spacing from the glass to the roof should be about 5/8 inch measured perpendicular to the edge of the glass. Also, as the glass reaches its upper stopping point, did the upper edge of the glass change tilt (angle) as the stop is reached. If the alignment of the rear edge of the glass is good (5/8" spacing and parallel) and/or the angle changed, the upper stops need adjustment. These stops are accessable with the aluminum shield in the door. The front stop is in the front eged of the door and is a 10 mm hex bolt. The rear is located in the rear and is also a 10 mm hex bolt. The window motor works like this: the motor draws a certain amount of current when raising or lowering the window. When the glass encountered a stop, the current to the motor goes up and this trips an electrical switch in the motor and the motor stops. Sooooo, changing the stops changes the stopping point of the glass. Play with the position of both (upper) stops until you get the glass parallel to the top w'stripping AND to the rear roof panel.
The second adjustment is that the glass may be moved up, down, forward and to the rear by loosening TWO special fasteners that secure the glass to the mechanical arms. Unless your car has been wrecked, the glass changed or someone has screwed with the factory position, this adjustment is not necessary. This is a tough job and will take some time to complete, if this adjustment is needed. The aluminum panel must be removed to move the glass on the mecanical arms.
The adjustments that I made to my 89 were with the two upper stops. The glass went up correctly and when it reached the top, the glass tilted position and the edge was not parallel to the roof top. Getting the upper stops in the correct location to seal the window and not damage the upper rubber took some trial and error....but I did it!
Sorry this is so long.
. I assume the door is not sagging and the hinges do not require adjustment. You first post indicates you just replaced the w'stripping on the door. There are two adustment that allow the door to fit the weatherstripping. The first and easiest adjustment is the height or location where the window stops going up (and down). This location where the window stops can be modified by moving some stops. To determine if this is the adjustment that is needed, do the following:
1. let someone sit in the car and let the window down two or three inches from the top. Do this with the door open. Then close the door. Have the person in the car raise the window up until it stops. The main reference point is to check the read edge of the window to see if it is parallel to the edge of the roof of the car.....and the spacing from the glass to the roof should be about 5/8 inch measured perpendicular to the edge of the glass. Also, as the glass reaches its upper stopping point, did the upper edge of the glass change tilt (angle) as the stop is reached. If the alignment of the rear edge of the glass is good (5/8" spacing and parallel) and/or the angle changed, the upper stops need adjustment. These stops are accessable with the aluminum shield in the door. The front stop is in the front eged of the door and is a 10 mm hex bolt. The rear is located in the rear and is also a 10 mm hex bolt. The window motor works like this: the motor draws a certain amount of current when raising or lowering the window. When the glass encountered a stop, the current to the motor goes up and this trips an electrical switch in the motor and the motor stops. Sooooo, changing the stops changes the stopping point of the glass. Play with the position of both (upper) stops until you get the glass parallel to the top w'stripping AND to the rear roof panel.
The second adjustment is that the glass may be moved up, down, forward and to the rear by loosening TWO special fasteners that secure the glass to the mechanical arms. Unless your car has been wrecked, the glass changed or someone has screwed with the factory position, this adjustment is not necessary. This is a tough job and will take some time to complete, if this adjustment is needed. The aluminum panel must be removed to move the glass on the mecanical arms.
The adjustments that I made to my 89 were with the two upper stops. The glass went up correctly and when it reached the top, the glass tilted position and the edge was not parallel to the roof top. Getting the upper stops in the correct location to seal the window and not damage the upper rubber took some trial and error....but I did it!
Sorry this is so long.
Last edited by Sam Lam; Mar 22, 2007 at 11:25 PM.
Racer
Joined: Jun 2002
Posts: 443
Likes: 0
From: Pueblo Colorado
I am facing this problem in the near future also.If you can PLEASE send along any further info to,
todd_vette@hotmail.com
Thank-you.
Melting Slicks
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
Vernon: Make sure you try the adjustments on the upper stops FIRST before you attempt to move the glass. If you need a photo of the stop adjustment bolts, let me know. I may have a photo somewhere......and I will have to look for it.
After installing the new GM door WS on my 89, I had a bad air/water leak on the drivers side glass by the rear view mirror. After some looking, the metal windshield post had a depression (???) in this area and I had to insert some filler material behind the WS. I did not expect to find this problem
After installing the new GM door WS on my 89, I had a bad air/water leak on the drivers side glass by the rear view mirror. After some looking, the metal windshield post had a depression (???) in this area and I had to insert some filler material behind the WS. I did not expect to find this problem
