I don't know if the Titan has rear climate controls but my Armada is having issues. The rear gets air via the front controls. But the rear will not let you adjust the power of the air coming through. It does let me switch hot to cold (I can hear it) but thats it. No air comes out when the front is on "R" for the rear controls. I pulled the knob off and put back on with no luck. Any other suggestions?