The dealer replaced the entire heater unit but I'm still having the same problems (on top of the check engine light for the front active shutters that got replaced as well as the dealer trashing my new interior). AC is ice cold at 60 and 61, blows warm at 62 unless the outside temp is warm. Drove the truck a few hours with the outside temp in the low 50's and it's either warm in the cab or you will freeze your butt off if you drop it to 61. The loaner Murano they gave me does the same thing so I googled it and apparently they've had this problem for a few years with many of their vehicles. I'd be curious to know how many of your titan's do the same thing. Trying to get a new truck or a buyback at this point, but if they all do it then I will look elsewhere for a truck. Had my last titan for 11 years with zero problems, this one has been in the shop since Dec 11th except for 4 days. If any of you guys could try this and report back it would be much appreciated.