Cadillac Seville / Cadillac Eldorado Forum Discussion, No Air From Vents in Past Cadillac Vehicle Discussion; I have a 1992 sts, and the vents refuse to open! the blower kicks on, you can feel a lil ...
Automobile(s): White Diamond '03 DHS (with floor shift)
Re: No Air From Vents
Defrost is the default mode in case of a vacuum leak (mode doors are vacuum controlled) so you should at least have full air from there. If the blower is working, but no air from anywhere in the car, then I would guess that the HVAC housing on the firewall has gotten brittle and developed a crack or hole and all your air is escaping under the hood. Somewhat common on older cars.