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Temp control dial with a row of buttons?
If so, does the heat come out the floor and side vents or just out the base of the windshield?
The system defaults to full heat without blower, defrost (windsheild vents only), no blower if there is no power, so if this matches your condition, check the fuse! Gets rather warm in there with a bad fuse.
If the blower runs, it's not the fuse, but could still be the monovalve. The valve is held closed by applying current, so if it's bad, it will fail open, causing full heat. If the blower changes speeds and the air flow comes out different vents depending on interior temp, the monovalve is likely bad.
Most other problems are the pushbutton unit itself.
If it's the manual system (one dial for airflow, two for temp, and blower speed buttons?? -- never seen one in the US), I believe the temp is still controlled by some sort of electric valve, doubtless failed on your car.
Peter
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!
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