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> What do these air flaps do?, And how important are they?
JeffBowlsby
post Dec 15 2005, 01:51 PM
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I bet most 914s don’t have these flaps anymore. These hinged flaps in the diagram are called ‘engine fan flaps’ or ‘non-return flaps’ in the parts manual. They close off the supply air duct path from the engine fan to the heat exchangers when the engine is off by gravity. They open up with the force of supply air to the heat exchangers when the engine is spinning, to circulate air through the HEs into the cabin, as assisted by the electric blower fan in the engine bay.

So the only thing I can figure is that after the car is hot and the engine is shut off, the flaps close to prevent hot air from entering the supply air fan plenum…but I can’t figure out why that’s important.

Any ideas?


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VWnDRAG
post Dec 16 2005, 05:47 PM
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Those little post-fan, gravity close, tin flaps right? I asked the same thing at my first engine pull party. Being a newbie, I either got the correct answer from a couple guys “in the know” or, everyone had a good laugh when I left.
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The reason for the flap is to keep mice from getting into the engine compartment. Supposedly the VW/Porsche engineers could foresee mice nesting in the fan housing. I guess it’s a bigger consideration when a car is sold globally.
A couple of the guys said they weren’t really needed and took theirs off. If they stick, it could hinder flow. But if a mouse does get in, it could smell really bad when you start up the engine.
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