Two ways to check -- first, the fan must drag quite a bit cold and
stationary -- if you try to spin it by hand it will be stiff. Once up
to temperature, it just speed up and roar and be impossible to stop
with a folded newspaper (keep your hands out!).
The other quick test is to watch while someone shuts the engine off at
a temperature where the fan should be drawing. If it turns more than
a single revolution after the engine stops, it's bad.
Peter
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