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It sounds as if it is time to find a new shop.
You may have a problem in the blower motor mounting. I have seen them improperly mounted and it caused vibrations of this nature.
I would check all of the fuses. There could be an external strip fuse that is cracked. It would be located outside the fusebox.
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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS
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