What do these air flaps do?, And how important are they? |
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What do these air flaps do?, And how important are they? |
JeffBowlsby |
Dec 15 2005, 01:51 PM
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#1
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914 Wiring Harnesses Group: Members Posts: 8,661 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None |
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? Attached image(s) |
bd1308 |
Dec 15 2005, 01:54 PM
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#2
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
they're real flimsy tin pieces....mine actually fell off at one point in time when my heating system was not connected.
b |
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