well, mine shows with almost 40 degrees more than it should.
So if outside temp is about 30degrees, in the dashboard appears almost 68-69.
I think that the sensor is not dead, because it works (wrong but it works, no -- ).
i have AC only, no Climate
It's not set to farenheight (sp?) is it?
Might be worth checking the 'A' pillar plug has a good connection and isn't gunked up / affecting resistance.