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luiher’s blower motor ran on a direct supply, but the regulator connector’s 12.4 V reading collapsed to 0 V with the motor connected. After investigating the fuse supply, the owner reported restoring operation by sanding a bad contact in the part identified as number 11.

An E550 owner's account of replacing the blower motor, regulator and cabin filter after cabin airflow stopped, including access below the glovebox and the reported result after reassembly.