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· Official Curmudgeon
5,207 Posts
I'm not trying to be argumentative but I find a few things wrong with your analysis.

Your statement: As far as the water stopping the fan...if it is a thermal clutch, even if the clutch is
engaged, the cold water shocks the clutch and they release rapidly
Half of the fan is already under water by the time the water reaches the clutch to disengage it and the
damage is already done.

Your statements;
the inertia of the fan blades (and the associated forces causing them to stay in motion) is minimal, as it
is directly tied to the minimal weight of the fan itself
whose large area (designed to work with air, not water)
are inconsistent. Even though the latter statement is made about non-clutch fans, the clutch fan still
has the large blades and therefore significant inertia. Have you ever noticed how long a disengaged
clutch fan will freewheel (still moving air) after the engine has stopped?

Depending on the RPM of the fan at the time, the strength of the arms attaching the blades to the hub,
and the distance between the fan and the radiator, less than 2" of the tip of the blade being in contact
with water could cause it do damage to the radiator.
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