the easiest way to check it is to forget the a/c setting (unless that's part
of the slide, instead of a toggle switch for the compressor).
Simply turn on the heater and see if it blows a lot of air on the floor,
then go to defrost and do the same, then go to vents and see if it moves the
air to those vents.
If you aren't getting much air at any setting from any vents, it could be
that a vacuum hose is completely disconnected and you wont' see any changes.
if however it does change on some settings, but not to the vents, it may be
a different issue.
Let me know.
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