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Many of these systems rely on a vacuum supply from the engine to operate the doors that change the direction of air. When the vacuum supply is cut off the system defaults to defrost mode. I would suspect you have a disconnected, pinched, cracked or broken vacuum line under the hood from the engine that leads to the firewall.

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Q: Why is the air conditioning blowing only through the windshield vent 2000 mercury sable?
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