The fan must be stiff when cold and spin at engine speed when started,
then immediately slow down. It must also pull with significant air
flow at idle with the engine hot enough to engage it (about 85 C I
think).
Also, when hot, it must stop immediately when shutting off, and this
is the easiest test. When the temp is high enough to kick on the aux
fans, the engine driven fan must stop with less than a full rotation
when the engine is stopped. If it turns more than that, there is no
longer any oil in the clutch and it must be replaced.
Your symptoms are exactly that of a bad fan clutch.
Peter
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