Odie,

The Blower Fuse "Blowing" is the Signal that your Blower Motor is most likely due
for Replacement.

(As they get older the lack of Lubrication increases friction and thereby ,Drag
which contributes to the need for more amps...which raises the resistance...
which increases heat ...ETC,ETC. They have "Bushings" instead of Bearings.
Some, I know of, on the W124 chassis have been successful in squirting a
little ATF into the Bushings to get a little more life out of the Motor.)

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'84 300SD sold
124.128