Best test is to get the engine up to the temp where you know it should be on (idle on a hot day until the aux fan comes one without the AC running), then shut off the engine while watching the fan (easier with a helper).

The fan blades must stop within one revolution. Any more and the clutch is shot. I have a spare for the 300TE, since the temp goes up to 100 or so in traffic -- but haven't managed to get it on yet. Probably will do it in a week or two, also the belt since it's been on there for three years at least now.

There should be enough increase in air volume to notice, but I don't know how much. I guess I could test the 300D sometime. However, the Volvo shoulds like a jet engine, no mistaking THAT for anything else!

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!