2001 Chevy Silverado replacment filters

If you are talking about the "Cabin air filters" they are located under the dash, under the glove compartment area. First you have to remove three hex head screws (9/32) that hold the big black "kick panel" under the passenger side dash area. Then there is an "L" shaped access panel (about an inch wide and 8 inches in length), it has a small hex screw at one end(towards firewall) and a catch on the "L" end(facing towards rear of vehicle). Unlatch the catch, pull down slightly and rotate it towards the passenger door. You will see one of the cabin filters, just pull it straight down to remove. There is a second filter that sits directly behind the first one, you will have to wiggle it toward you then pull it straight down like the first one. (My filters were disgustingly dirty) I went to advance auto and got the Purolator filter #C15388 as the replacement. When you put the new ones in, ensure you observe the flow direction of the filters (arrows should point towards the drivers side when installed). When you attach the kick plate, the screw that is closest to the center of the vehicle was such a pain to put in, I eventually decided not to put it back in, the other two are sufficient enough to hold the kick panel.