It's behind the glove box! Try search for "microfilter". Can be a pain to remove the glove box as the top inner part must be collasped for removal.

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MERCEDES Benz Master Guild Technician (6 TIMES)
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44 years foreign automotive repair
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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