I have replaced no less than 10 blower regulators this month...We sell them in the partsshop if you wish to save money. The shop will charge one hour, and you should be able to do it in that amount of time. It is located under the black plastic panel just below the windscreen under the hood. 7 phillips head screws hold down the panel and either 2 phillips or 2 torx bolts hold down the regulator. (under the air filter)

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM