When the recirc button is on, air from the outside should not be able to come in right? If so, what's the problem?

A/C is broken but I still use the middle (bi-level) button.

thanks,

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sjsfiji

'87 W124 260E (DD)
98K orig. mi. @7/15
CLK 7-Spoke Forged Wheels
Neuspeed springs/Bilstein Sport
4/3 bump (F/R)

'97 993 Carrera
106K orig. mi.
Always driven like it's stolen