I will be getting my '94 940 shortly -- my first Volvo, and my first rear-while drive car in Decades. Used to live in northern New England, now live just outside Washington, DC. We get an occasional biggish snow; and some junky mixed precip. Snow here tends to be "greasy" -- higher temp an...

I am planning to buy a 1994 Volvo 940. Question re dashboard: To the right of the switch for rear defroster is a space for another control -- with just a small circular thing in the center, as if the switch has fallen off -- or never existed. Can anyone tell me what normally would be controlled at t...