[Chrysler300] Fan Clutches

[Marshall R Larson <yelof@xxxxxxxx>]

I have uncovered some specifications about thermal and non-thermal
clutches.

Non-thermal: Will be driven at 50% to 60% of water pump RPM 100% of the
time.

Thermal:  Will be driven at 5% to 10% of water pump RPM until more
cooling is required.  When the temperature of the air coming through the
radiator gets high enough, the clutch will be driven at 40% RPM.  If even
more cooling is needed, its driven speed will ramp up proportionate to
the increase of the air temperature at the radiator to a maximum 85% of
RPM.  As the need for cooling decreases, the driven RPM decreases
proportionately.  When no additional cooling is required, the driven RPM
drops back to its idle speed of 5% to 10% of water pump RPM.

Summary:  

Non-thermal:  Causes greater parasitic loss all the time but will not
provide more than 60% of water pump RPM even when more cooling is needed.

Thermal:  Causes less parasitic loss most of the time but can provide up
to 85% of RPM as the demand for cooling increases.

A Hayden #2705 is a thermal clutch and has the identical dimensions as
their non-termal clutch 
#1705   The #1705 corresponds to the Parts Master #36949 that Tony
provided.  I suspect that Parts Master has a thermal version of their
own. 

Minnesota Marshall

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