If you have the key, insert it, turn it to the 'lock' position, and insert a paper clip into the tiny hole in the face of the bezel. Turn the key to work the lock cylinder out.
If you do not have the key, I suggest removing the passenger door lock, taking it to your local locksmith and having a key made from the 4 digit code stamped into the lock, (costs less than $30), and use this key for the ignition.
Remove the retaining ring from the top of your 1979 Chevrolet C 10 pickup truck ignition switch. Slide the ignition switch out and remove the wiring harness.
The 1966 Chevy Impala ignition switch can be removed by loosening the retaining ring at the top of the ignition switch. Remove the wiring harness. Reverse the process to install the new ignition switch.
The 2001 Chevrolet Camaro ignition switch is held in place with a retaining ring. Remove the retaining the ring and slide the ignition switch out. Remove the wiring harness. Reverse the process to install the new ignition switch.
Chevy Tahoe Ignition Key Starter Switch
You can change your 1995 Chevrolet ignition switch by removing the ring at the top of the ignition switch. Slide the ignition switch out and remove the wiring harness. Reverse the process to install the new ignition switch.
http://www.topix.com/forum/autos/chevrolet-impala/T4P2NGT979PJ7QT2P
The 1985 Chevrolet El Camino ignition switch can be removed by loosening the retaining ring at the top of the switch. The switch will slide out. Remove the wiring harness from the back of the ignition switch.
You will need to remove the retaining ring from the top of your 1989 Chevrolet blazer ignition switch. Slide the ignition switch out and remove the wiring harness. Reverse the process to install the new ignition switch.
Remove the retaining ring at the top of your 1993 Chevrolet K 2500 ignition switch. Slide the ignition switch out and remove the wiring harness. Reverse the process to install the new ignition switch.
I'm told this is a common problem that Chevrolet is aware of. Contact your local dealer. They should be able to replace the ignition switch and charge it back to Chevrolet as a warranty repair.
n ignition switch on a 1991 Chevrolet astro vanAnswern ignition switch on a 1991 Chevrolet astro van
You will need to remove the retaining ring at the top of your 1979 Chevrolet El Camino ignition switch. The ignition switch will slide out. Remove the wiring harness. Reverse the process to install the new ignition switch.