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Well that usally means you have a rat or mouse nest in your heater vent box. Pretty common if you live near open fields. Take the vent box apart to view any blockage from the heater core to the vent box or a hanger gently down the vent opening see if you pull grass or straw out.

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Q: 1999 Buick LaSabre ac vents dont work only on defrost?
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