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Old 02-01-2005, 10:04 AM
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jeffcoslacker jeffcoslacker is offline
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Re: question bout a weird noise

Quote:
Originally Posted by Jonn
In my 91. at random times, usually sitting still when i hear it, and only if you slightly rev the engine, from behind the dash i get this weird sound as the revs head back to idle, it sounds like vaccum, but.... sounds like some sort of plastic/rubber diaphram is talking, sorta a "burp" sound? like a fluttering valve of some sort, anyone know what this might be? i am only worried about maybe a possible source of a vac. leak or if its something normal. Car does have AC and it works fine as does all the controls, sound only appears with slight revs..
Shot in the dark time, but I would guess you are hearing the actuator for the blend door in the heat/AC system. It may be starting to leak slightly, causing it to drop the door slightly under low vacuum, then recovering when the throttle closes and vacuum builds.
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