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before washing his 99 C4, my dad placed a small platic bag on the engine intake duct to supposedly prevent water from entering the engine when he washes the car. he showed me later a handful of water from the plastic bag. makes me wonder if there is any wisdom to this. sorry if this sounds stupid but i get to drive it his pleasure is keeping it clean and shiny to stare at. :D

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Not necessary since any water that gets in will drain from filter housing anyway. Howver, the proper response to your dad would be something like: "great idea Dad, you are soooo smart".

Yeah, what every dad needs is a wiseass sarcastic son.

Better to remain silent.

It's quite possible that "Dad" long ago realized that those water drain holes in the bottom of the filter "box" are a possible source of heated intake airflow and intentionally blocked them off so that the engine only gets the "cool" inlet airflow from outside the engine compartment.

Edited by wwest
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Nothing wrong with your post, I washed the car yesterday and tried the trick, but didn't get much water on the intake at all. I use the finer mist from the hose on the top, and the high velocity stram on the bottom to get the crud out.

This is a technical Porsche site, not a Dr. Phil parenting site. Some people have many issues, you can ignore them, and keep your car thoughts or findings coming.

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