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Could also be a bad cabin temp sensor blower motor (behind the right dash vent) or a hose fallen off, so that the interior air temp sensor doesn't have air blowing past.
Other possiblities are a bad wire so that the monovalve opens when it shouldn't, and someone pointing the center dash vents up -- this blows cold air right from the vent onto the temp sensor (it's beside the sunroof switch) and will turn the heat on. Keep them pointed down, and if it's too cold, close the vent down, don't point it up. You could also have a defective pushbutton unit.
Most likely is a bad monovalve or wire to monovalve.
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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!
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