C3 Corvette Windows - A Clear Choice

Photograph or write down the location and direction of the components on the window before removing them. Protect the glass by placing it on a soft surface such as a carpet, towel, or the box the window came in.

Fortunately, many replacement parts are available for the windows. Zip Products offers a kit that includes mount bushings, glass bumper and cap, front roller, and roller/slider assembly. Also of interest are the rubber washers (three per window). A special tool is available for the round nut plates that secure the sash bolts to the glass.

Install the parts onto the new glass, ensuring that they go in the proper direction. Tighten the bolts and nuts snugly but cautiously; don't over-tighten. The sash-attachment bolts can't rattle loose when the nuts are installed on the sash.

While you're at it, consider removing, cleaning, and lubricating the window channels. The sash is easily removed. The channels require a little more effort, but it's worth it if the windows don't move up and down smoothly. Also, clean the inside of the door, especially the drains.

Another thing to consider replacing now is the main door weatherstrip. The new weatherstrip highlights how much the molded end has deteriorated from UV exposure. The ends on the front and rear have a rough life trying to seal the door against both the window and the body.

Install the new glass by installing the slider into the front channel and then guiding the bolts past the upper doorframe. Line up the bolts with the holes on the sash and install the nuts. The upper attachment of the front and rear channels enables the window to be adjusted forward or backward.

Install the outer window seal into the door. The replacement seal has a wide, soft rubber lip. The original weatherstrip was felt-covered. Apply adhesive to the back of the weatherstrip if the snaps don't hold it securely to the doorframe.

Install the anti-rattle bumper, the window upper stop, and the upper attachment bolts for the window channels. New stops and bumpers are also available from Zip Products. Check to see if the replacement bumpers require metric bolts.

Adjust the window if needed. Move the short horizontal channel to position the glass parallel with the windshield post. Move the upper stops until the window seats properly in the roof weatherstrip. Move the front channel to adjust the window forward and aft. Finally, move the window channel upper attachments to adjust the window inboard or outboard.

Install the moisture-barrier film or tape over the holes in the inner door panel. Aluminum duct tape works well. The project is finished with installation of the door panel, which is the reverse of the steps in the removal.

One item to note during installation is that the lock knob only goes on one way: there are no splines on one side. After installing the knob, pull on it to make sure the clip is secure. If the car has manual windows, put the window up or down to install the handle in your preferred position.

The disfigured glass is gone, and perfect glass is in its place. The window moves up and down smoothly and seals against the weatherstrip. Door-glass replacement was a clear choice to make the visual component of driving more pleasurable for both driver and passenger.