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That's the downlevel climate system. The standard car had dual zone semi automatic heat, you could add air conditioning (like that car had), and if you had large wad in your wallet to burn you could get the single zone fully automatic system (which is what all US spec cars have).
The semi automatic system would try to keep the temp coming out of the vents the same, but didn't control air direction or fan speed.
-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.
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