I have the same ticking sound coming from the dash when I use the controls for the heat. I took it to the stealership and they told me it was the metal cooling down. I know it doesn't make any sense to me either. I have had it going on for quite a while now, I just ignore it, if you figure out what it is though please let me know I am curious about it.So I bought my titan a few weeks ago and I love it. Only a few problems though. When I turn the heat on to upper and lower it makes a clicking sound for like 10 seconds then shuts off. The sound is coming from the inside the dash. Also when I am accelerating from a stop sometimes the slip comes on and it sounds like its grinding something. Any help at all to a young kid with a big truck:redblob"