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Your windshield protects you from debris, keeps the roof from caving in during a rollover and helps keep you from being thrown from the car during an accident. You should replace the windshield on your C3 Corvette if it has any long cracks or chips in it. If you have experience working on cars, and the aid of an assistant, you can do the job yourself. You can purchase almost all the tools and supplies from any auto parts retailer.

Instructions

1

Unscrew the rear view mirror and slide it out. Set aside.

2

Lift up the wipers and pry them off the car with a large flathead screwdriver positioned between the large nut and the arm. Rock the screwdriver back and forth until the wipers come off. Set them aside.

3

Seal off the vents on the dashboard with masking tape.

4

Cut away the windshields rubber gasket by inserting a knife into the rubber next to the windshield glass from inside the Corvette. Cut all the way around, then push the glass out with your hands or feet while a friend wearing gloves catches it from the outside.

5

Wipe the edge of the windshield opening with a damp cloth. Wipe the sealant off of the replacement gasket. Put the gasket in a sunny place to make it more flexible.

6

Fit the new gasket around the new windshield with the gaskets slit facing outside the vehicle. Run a bead of sealant along the bottom half channel on the gasket.

7

Wipe petroleum jelly into the gaskets outer groove, applying a little extra to the top center and bottom center. Starting at the bottom center, put the heavy nylon cord around the outer groove. Leave about a foot length on each end hanging out the bottom center.

8

Place the windshield into the windshield opening from outside the Corvette. Make sure the cord ends dangle inside the car.

9

Pull one cord end slowly out and all the way around the frame. This will pull the rubber lip of the gasket into place. Ask your helper to press the gasket onto the outside edge of the vehicle.

10

Reinstall the rear view mirror and wipers. Wait 48 hours before driving the vehicle.

C3, also abbreviated CCC, stands for Computer Command Control. For GMC and all General Motors vehicles predating 1996, the C3 system encompasses a vehicles Electronic Control Module and the engine-related diagnostic system.

First Generation On-Board Diagnostics

In 1996, the Environmental Protection Agency made vehicle diagnostics standard for all makes and models. Before this policy became law, automotive manufacturers used their own unique diagnostic systems. For all General Motors vehicles, the process of access trouble codes differs among Fords, Chryslers and other vehicles. Collectively, this is now known as OBD-I. Everything after 1996 operates under OBD-II standards.

C3 Flash Codes

Once a GMC vehicles ECM detects a problem, a diagnostic trouble code is created. Accessing these codes requires putting the GMC into a self-testing procedure. This can be done by connection the "A" and "B" slots on the GMCs data outlet, which is located directly beneath the steering wheel. Once the ignition key is turned to "On," the codes will be relayed through a flashing check engine light.

Deciphering Flash Codes

General Motors flash codes are numbers comprised of two characters. The first number is represented by a long flash, and the second number is conveyed with shorter flashes. For example, GM code 26 will be two flashes followed by six brief flashes. Code 12 is flashed at the beginning of a self-testing procedure. It does not correspond with a diagnostic problem.

Looking up GM Flash Codes

The system will flash only the codes themselves. When using the self-test procedure, an owner will need to locate definitions for General Motors flash codes. These definitions can be found easily online (See Resources). However, a GMC-focused Haynes or Chilton repair manual also will contain the needed definitions. A GMC owners manual will not feature these definitions.