The problem is when you have high pressure air coming in from the back side of the hood, it can stall the air coming in through the grill, reducing airflow through the radiator.
That's at speed, though. At a stop, it'll still vent hot air. That's why we need to check which direction air is moving at speed.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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