| My 190 was making a weird noise behind the glove box a few years ago. I was told by a MB mechanic friend of mine that it was most likely the Vacuum Switchover Valve.
The noise went away and hasn't returned.
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If it ain't broke, BREAK IT.....and make it better. 
2001 SLK230
1993 190E 2.3
1971 Corvette LS5 Roadster
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