Hi all,

I've blocked off the main air vent under the monowiper of my W124 260E because I couldn't stand the smell of exhaust fumes from the outside even if my a/c is on recirculate mode.

As a consequence, I must keep the a/c system in recirc mode all the time. Otherwise, it will not blow any air because the blocked vent keeps outside air from getting in.

When I push the accelerator down so that the economy meter's gauge is 3/4 of the way to the "gas guzzling" (rightmost) side, the a/c blower acts like recirc mode is off (I make sure it's on all the time). Once the needle swings back to the middle and back to the economical side of the gauge, air starts flowing again.

I know it's bad to block the main vent because it was designed that way to prevent mold, prevent the windows from fogging up, etc.

I can't floor my accelerator because the a/c tries to suck in air from the already blocked main vent.

Is this normal?

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