boost vs. a/c?

[PeterBergin at aol.com]

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Had the same problem with my old 5ktq avant. Can either be a vacuum leak or a
failing AC programer or what ever they call the black box with the vacuum
valves that control the vents etc.  The box is made by Delco and was used in
Cadilacs of the same vintage.  Got one from a junk yard for $20.  It lasted about
a year and ended up buying a new one from Blau for about $100.  It is a pretty
easy install, sits behind the glove box.  Check for vacuum leaks first.

Good luck
Pete 91 Avant