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Q: heater woriking but not getting air through vents. Hear blower on. on 1999 Ford F-250 Super Duty

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My heater is working. I can feel hot air. I can adjust the blower and hear it working, but air is not coming through vents no matter what the setting. I think it is a vacuum issue but cannot narrow it down.
(1) Answer
It is definitely a vacuum issue. Most likely a hose disconnected under the dash or under the hood. Look under the dash - both sides - first.