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

(1997 Buick LeSabre)
in Cordova, TN on October 28, 2012
Blower motor, relay ,fuse have been checked. All good
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of Greg's Orange Auto on October 29, 2012
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
on October 28, 2012
VACUUM LEAK UNDER HOOD PASS. SIDE SMALL HOSE OR PLASTIC TUBE. BEST GUESS! VACUUM IS WHAT SWITCHES MODE SLECTOR!!
on October 29, 2012
With blower motor running is the fan moving air or not? if it is, there is blockage in the air ducts.
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