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Heater woriking but not getting air through vents. Hear blower on.

(1999 Ford F-250 Super Duty)
in Dearborn, MO on December 31, 2010
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.
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Popular Answer
on December 31, 2010
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.
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