Don't know -- the heat ducts are under the front seats for rear heat, don't know if the console vent is for heat or works just like the center vents on dash.
If you are supposed to get heat out there, you may have a bad vac servo in the dash.
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!