yes - so I should be able to find this check valve inside the door cavity? its not somewhere else further up the line before it gets into door? when i turn the car off, i do here this high-pitch wheezing that peters out after 10-15 seconds (hey...), and its coming from somewhere behind the steering wheel area of dash. i assumed it could be anything, or AC pod related.

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Andrew
Montclair, NJ
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1982 300D Turbo
120k
Petrol Blue Green