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Old 12-26-2001, 07:04 AM
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engatwork engatwork is offline
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,232
My initial thought is a vacuum system or damper actuator problem. Try to "feel" a difference in air flow from one of the vent discharge. Put your hand over them one at a time and see if you can "feel" the air flow speeding up or slowing down in time to the sound.
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