Vaccum lines
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Not sure for a 99 but in mine (01) those lines adjust the air vent. When the car is in f.e. uphill and the ac/fan is on, it will blow automatically blow in defrost mode (on the windshield), no matter which position the vent switch is. These 2 vacuum lines regulates this. I can take a picture of where mines are connected when I get home if your interested.
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