Authur Dalton brought out the suggestion the when you replace the strip fuse
put a "Slight" Horizontal Convex bend (UpWards in the center) in the fuse...
thereby allowing the fuse room to "Flex" with the electrical load at motor
startup (And the concurrent heat load).
If the fuse is "Strapped Down" tight between the two screws, without any flex
room,the brittleness factor increases exponentially.

This would also apply to your Glow Relay 80 Amp fuse.

I am Not Espousing the W-1 diagnosis!
But, you asked for the location...Left side behind the instrument panel.

If I were sweating buckets...
#1. find the 30 Amp strip type fuse (in it's single black flip top holder)on top
of the Driver's side Shock tower...cross the two screws with a jumper wire
with the key turned on and A/C control fan speed "ON" ONLY FOR A SECOND.
[as a2t suggested]
DO NOT RUN AROUND WITH THE SCREWS "JUMPED",PATTING YOURSELF ON
THE BACK,'CAUSE A BAD BLOWER WILL TAKE OUT THE CCU (climate control
unit)

If Blower runs just pick up a couple of strip fuses and you're freezing again!

Now we're flying without the hood!

Arthur Dalton speaks:

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'84 300SD sold
124.128