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W126 Tips
Be Certain to check the area in the cowl for leaves and any thing else which can be flammable. There are parts in there which can start a fire!
The fuse terminal for the high climate-control blower can overheat when the blower is run on High a lot; it turns loose, and can get against something in the bottom of the fuse box, and it is hot enough to melt through insulation on wiring in the bottom of the fuse box and give a few amps to some other circuit (in my case, it was the outside temperature indicator which was fried, emitting a great cloud of smoke inside the car, etc.). There was a service bulletin, to replace this fuse with a remote-mounted fuse. My car never got it.
I hope these help someone.
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