Yup, that's the small blower for the climate control temp sniffer. The other end of the tube goes up by the dome light to the small grille.

When you take it apart to oil it do NOT turn the wheel backwards.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.