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My point is the air intake or the heat exhaust vent have different shape exactly to prevent this venturi effect that the OP is talking about.
In my opinion, the AOS or the fan resistors and even the IMS are perfectly designed and all of those systems work for thousand and thousand miles like they are suppose to.
The fact that they fail on many cars, and I agree with you on this, is probably the consequence of suppliers who put crap in the material used to build the parts.
But again, this is just my non engineer opinion.
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