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Why won't my Ac/heater blow out the vents on my Buick regal? on 1997 Buick LeSabre

Blower motor, relay ,fuse have been checked. All good

Asked by for the 1997 Buick LeSabre
ck vac lines under hood that go thru firewall on p/s there could be one that is broken and not letting vac get to controller head
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2 more answers
VACUUM LEAK UNDER HOOD PASS. SIDE SMALL HOSE OR PLASTIC TUBE. BEST GUESS! VACUUM IS WHAT SWITCHES MODE SLECTOR!!
With blower motor running is the fan moving air or not? if it is, there is blockage in the air ducts.