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Auto Repair Manuals

1992 buick lesabre, air conditioning, air alternates between dash vents and windshield wile driving whats wrong?

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sounds like you are loosing vacuum to or from your surge tank.

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your mixing valve control in the dash might also cause the problem.

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check vacuum, vent doors are spring loaded if the diafram looses vacuum it will close. donn't think control valve can leak and seal it's self.

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