Make sure the vac line to the thermo valve is on and the valve itself is working. Fan speed is manual on the 190, so I would guess something is wrong with the pushbutton unit UNLESS it also does automatic fan speeds (I don't know -- will find out when I get the one I have a new starter).
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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