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My '96 S500 (M119) also makes a "whirring" noise when the key is on, engine off. Removed the air cleaner assembly and the noise is clearly coming from the throttle body area... its done it for as long as I've had the car... always thought it was normal but don't have another to compare it to...
Anyone?
Thanks.
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KenP
1996 S500 W140 Coupe
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