The vent at the rear of the center console is a fresh air vent only. Onpening it allows fresh air to the rear cabin. For winter use simnply close it. The heat comes out from under the seats.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.