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May have air lock (bubble) in cooling system. My 91 Sierra did that. Tried everything. Finally installed flush kit between engine and heater core, removed cap poured coolant into flush inlet until fluid ran back to radiator. Heater now will run me out of the truck cab.
Without a key you cannot remove the lock alone. You must remove the ignition housing. It is fitted with shear bolts when new, so where the bolts sheared off will look like two spherical dome. Use a small sharp chisel to start unscrewing them the first turn or so, after that, they will only be finger tight.
never did it in a 2002 chvy first off...go to napa...or what ever your local part store is and buy a manual...easy repair...the manuel gives pictures...you replace one end from under the hood...the other you may have to get under the car...if your skinny no prob..if not ...get some jacks...book will explain all..easyl..repair...