Wobble is more likely the support bearing (water pump is on the other side on this car, I believe).

The fan must run up for a few seconds on startup, then slow down.

It must then engage when the rad gets hot, moving much more air than when cold.

Best way to tell is to let it get good and warm (aux fan runs once, say), then watch the fan while someone shuts it off. If the fan turns more than one turn after the engine stops, the clutch is bad.

Some people have refilled them with silicone fluid from Toyota, but I suspect they fail because the seals go bad and the new fluid will leak out in short order.

If the clutch is encrusted with dirt and very sticky oily crud, the clutch is shot -- the sticky stuff is the silicone oil.

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!