2000 yukon climate control not working

I have a 2000 yukon and the climate control stopped working. The defrost works just fine but the heater/ac stopped working nothing blows out from my vents when ac/heater setting is on. I checked all fuses and wires and everything is ok and connected. I just replaced my cd player and the next day climate control stopped working. I went back and checked the wireing of the cd player as well, everything is fine. Would i need a new climate control, or senser or is there a fuse on the heater itself. Please help im confused. Thanks

most likely when the CD or radio was replaced the climate control connections were not properly hooked up or the climate control module went out. You can get this from a junkyard.