Worts case scenario would be a problem with the climate control head unit. I lost one on my 85.5, the air dam sliders did not work at all.
Best case would be either the vacuum solenoid, or possibly a broken vacuum line behind the glove box.
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2021 Model Y
2005 Cayenne Turbo
2012 Panamera 4S
1980 911 SC
1999 996 Cab
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