1990 vintage Bosch Blower Motor "Bushings"
(NOT BEARINGS,AS WOULD BE SANE!)
The Damn "El Cheapo" "Bean Counters" not only "Shorted" US on Wiring Diameter
,BUT also specified Blower Motors with Narrow Little Metallic Bands INSTEAD of
Roller Bearings for the Blowers.

Scenario:

As the Bushings AGE they restrict the Rotation of the Shaft (Friction)
[SINCE the interface has NO LUBRICATION]
MORE FRICTION = MORE RESISTANCE ,
as the motor works to overcome the friction...MORE Resistance.
MORE RESISTANCE = MORE HEAT.
MORE RESISTANCE AND MORE HEAT = 30 AMP fuse BLOWING!!!!!!

The FSM calls for ATF as a lube for the "Bushings"
BUT,given all the Excrement to just get down to the motor,I'd
SOAK the Bushings for 24 HRS in 3in1 oil.

I know all this because:
My Blower Motor was replaced Less than 1,000 miles ago
It only "Draws" 23 amps D.C.

If I ever get "Down There" again,I'll look for a retrofit for BEARINGS and
post it.

HELL,given my current state of mind I'll modify an Electric Leaf Blower
mounted in the Trunk (and Plumbed to the engine compartment) to
Stand In for the BLOWER.

__________________
'84 300SD sold
124.128