daddiojiggy, he plainly said in his message that he checked in his owner's manual and didn't see it. Why so upset at such a simple question anyway?
umpalumpa, my mech has said that these LCD displays occasionally go bad with age. What you're probably seeing is its best attempt at telling you the outside temperature as the others here have astutely noted. There should also be (or at least there is in my W124) a '+' or '-' preceeding the number to denote degrees above/below freezing.
I'm not really sure what's involved in fixing this though.
'95 E420 - 'Shadowfax
'92 Volvo 740Turbo Bard
'74 240D - 'Ol' Green
' 4spd Manual 104kmi. (sold
'77 300D - 'Red
' 223kmi (sold)
'75 240D - 'Bianca the Blue Bomber