well today my overhead was sayin that it was minus 30 degress celcus then it would go to plus 3 then go to minus 5 then back to minus 16 and it was really maybe about minus 2 out what would make it go all over the place all of a sudden ti has never done it before?

 

Mine has acted weird too. It has been 25 degrees or so off a several times, then all of a sudden I look at it and its back to normal.

 

There's a TSB for this, do a search you should find it.