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Auto Problems Questions

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

Submitted by papaglenn007 on Sat, 10/31/2009 - 09:43
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Submitted by mws919 on Sat, 10/31/2009 - 09:56.
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sounds like you are loosing vacuum to or from your surge tank.

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Submitted by jerryh20 on Sat, 10/31/2009 - 13:07.
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your mixing valve control in the dash might also cause the problem.

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Submitted by schin on Sat, 10/31/2009 - 15:13.
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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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