It is not accurate to say that the wheel can be left alone in its neutral position and the system will be entirely automatic. In my experience, the "fine tuning" wheel needs to be adjusted regardless of what the temperature is set at other than when it is at an extreme - very hot or very cold - and the whell is just kept at all RED or all BLUE. Having to constantly adjust a little wheel to obtain the desired temperature is not fully automatic, in this user's opinion. Its not like I'm am amateur with this thing; I've been fiddling with that damnb wheel in 3 cars over 10 years with the same results.