I have a 2000 GMC Sierra. The radio presets do not save once the ignition is turned off.

SOURCE: 1997 GMC Sierra Truck Ignition Switch

its a long process,you need a steering wheel puller, once its off take the hazard button assembly out, take the turn signal loose, pull old ignition out, carefully install new one, and reverse procedure and always if u get confused i would highly recomend
a chiltons manual they explain things great

SOURCE: The radio on my GMC Sierra is locked. Does anyone

YOU CAN CALL YOUR LOCAL DEALER, GIVE THEM THE VIN # AND THEY CAN TELL YOU THE CODE AND HOW TO DO IT FOR FREE.. GOOD LUCK KEITH..

SOURCE: 1997 GMC Sierra Ignition Switch Replacement

take off the cover on the top and bottom of the steering column just behind the wheel. pop the tilt lever out simply just by grabbing it and give it a good tug. then once you have the new switch and you get in there your going to need an inverted torx socket to remove the small bolts that hold the switch to the column. do not move the gear on the new switch make sure it lines up exactly as the old one did!!!!!!!!!!!!

SOURCE: Unlock the radio

radio is locked were can i get code is it on truck somewhere

SOURCE: how 2 remove blower motor on 2000 gmc sierra

you will see the motor on firewall. Should have 3 bolts to remove. Remove bolts and seal.