Hey everyone, brand new user here. I have an 06 Tahoe z71 with 160k miles on it. Since I bought it, everything has been fine until a couple weeks ago. My rear AC doesn't blow, for starters. Front works fine. My rear door hatch opens, but will not lock, and there is no manual key lock. There's also a persistent "clicking" noise coming from inside the rear door hatch, running or not. I checked the ground harness, and it is in good condition. I've posted elsewhere and can't seem to find answers or people who have had this issue before. I'm at a loss and any advice would be really appreciated!!

 

The clicking you hear from the rear hatch is probably the lock actuator trying to either lock or unlock. The button that activates it is probably stuck/bad and the actuator may also be bad. The rear A/C not blowing could be many things. A blown fuse, a bad blower motor or resistor, a bad switch and so on.