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

by in Cordova, TN on October 28, 2012
3 answers
ANSWER by , October 28, 2012
VACUUM LEAK UNDER HOOD PASS. SIDE SMALL HOSE OR PLASTIC TUBE. BEST GUESS! VACUUM IS WHAT SWITCHES MODE SLECTOR!!
ANSWER by , October 29, 2012
With blower motor running is the fan moving air or not? if it is, there is blockage in the air ducts.
ANSWER by , 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