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Regardless of the buttons (all three) are in or out the sound of leaking air happens when turning off the car or letting up on the gas. My guess is that the sound is coming from near the reservoir. I'll attempt to open up the console while marking electrical contacts I remove in hopes of getting an eye on a vacuum hose that has split or something.
It sounds like the fresh air intake is moving when I depress the recirculating button.
I already swapped out the vacuum valve in the engine compartment with a car that doesn't make this noise.
My current cars: 90 245 white (CA), 90 245 white (rebuilt front end), 91 245 maroon, 83 245 blue (daily driver)
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