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Old 06-05-2001, 07:40 AM
mbdoc mbdoc is offline
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Very common failure is the **fresh air** flap diaphram. By operating the system in ec this diaphram doesn't receive vacuum. There is a vacuum distribution block that sends vacuum to all of the flap diaphrams, have the vacuum diaphrams tested for leaks there. The vacuum lines(2 stage) that operate the fresh air diaphram are dark red & green with blue tracer.
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