the bottom line goes somewhere onto the EZL area, but where does the top line go? is it just a plug?

this is a 1993 190E 2.6 with EGR and no vacuum temp sensors on the head.

It goes to the thermo valve on the Head (on the coler fan side).

By the way, Is the throttle body stil accessible as on the picture?. If yes, Could you please measure the gap between the flap and the body when it is closed?

In advance many thanks

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Present cars:
My car: E-class 420CDI, 2008, W211, V8, 180 000km

Wife's one: C-class 220CDI Sport Coupé, Euro, 2002, W203. 345 000km

Son's one: GLK class, 220CDI, 2009, W204

Sold: E-class 260E, 1988, W124, Wonderfull car sold after 489 000 kilometres of reliable services (engine M103, clutch, brake system and 5 speed manual gear box all original).

Sold: E-class, 320CDI, W210, 2000, 225 000km

this is a 93, i dont have a thermo valve on my cylinder head

and yes, ill try to measure the gap between flap and body, intake is completely off car at this moment