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Originally Posted by yogi_123rd
The vent system works on engine vacuum. The heater's default when there is no vacuum is to send air out the defroster. Lack of vacuum is your probable cause of your problem.
The heater/ac source vacuum line is found under the hood, to the left of and below the master cylinder. Look for a rubber vacuum line going to a connection on the firewall. This line usually falls off from dryrots.
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to yogi_123rd - Thanks for the info. Found it easily, and the vacuum line had indeed fallen off. Will replace it tomorrow.