The rear consol vent blows only cold air, close if for winter or the passengers will freeze.

If the front footwells are cold, you have a leaking servo and no heat (or a broken vac line if you have most of the air going up the windshield all the time).

If the front footwells are warm, remove the extra floor mats in the back -- they are almost always too long and usually block off the heat vents under the front seat. Remove any other accumulated odds and ends as well.

Peter

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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!