I have a 2005 Freight liner, the air keeps going cool to hot, any suggestions?

Question

The air in the sleeper does not work, even when the optomized idle is set. The temp. keep fluctuating in the cab area.

Answer 1

I would take it to a shop and let them take care of it as there is problems that I can`t explain so you would understand, and it will take a mechanic to fix and probly needs freon.

Answer 2

low freon is the likely culprit.  if freon gets to low unit will not operate at all.