Actuators are probably out. You will usually hear a clicking under or in your dash whenever you change your temp.control or air flow control most of the time both go bad about the same time.
Very common problem with the first gen.Titans.
There are threads on here about this and what to do about it. Check out the thread, That a knowing clicking under the dash.
Very common problem with the first gen.Titans.
There are threads on here about this and what to do about it. Check out the thread, That a knowing clicking under the dash.