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91 745t vacuum leak in dash 700 1991

posted by  David M on  Sun Jul 13 02:03 CST 2003
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I recently began to hear a loud vacuum hiss in the dash area upon engine start and when selecting the vent position with AC on. Its not the usual momentary hiss heard when changing air source positions but a very loud constant hiss. Also when under boost the air comes out of the defrosters and floor regardless of control setting. It appears to be coming from a double acting servo mounted on the left side of the plenum. Anyone have any insight on this? Thanks very much!

David






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