The white-down setting keeps the AC compressor running all the time. So the system should be always drying the cabin air. Make sure the drain tubes leading out of the car are clear, and if you smell anitfreeze in the vents, there might be a small coolant leak.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma