Electric clutch or visco clutch?

If electric clutch (as I think it is), you need to check operation (temp sensor switch) and engagement. If it switches on but doesn't speed the fan up, you need a new clutch, if it never switches on, you need to fix the sensor system.

I'm not very familiar with it, though...

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!