To add to Corky,

The blower is over to the right hand side above the passenger's footwell. I have replaced many, and now can do it quickly. Your tech needs a Mercedes course or two.

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Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM