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

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Blower motor, relay ,fuse have been checked. All good
(3) Answers
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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
VACUUM LEAK UNDER HOOD PASS. SIDE SMALL HOSE OR PLASTIC TUBE. BEST GUESS! VACUUM IS WHAT SWITCHES MODE SLECTOR!!
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