1987 260E. From full, it takes about 3-4 days before the A/C stops functioning.

I swapped the shrader valve and the refrigerant is still leaking somewhere.
I also plugged that valve with the recharging device as well in hopes that was where it was still leaking but no luck.

Carpets are not wet in the interior.

Where else should I look to figure out where its leaking?

PS: It was converted to R134a by the dealership at some point in its life as there is a sticker, but the text has faded beyond recognition.

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