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) |
double-a |
Dec 16 2005, 09:31 AM
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#2
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Senior Member Group: Members Posts: 988 Joined: 15-September 03 From: vancouver, wa, usa Member No.: 1,162 Region Association: Pacific Northwest |
last time i was under there i noticed the starboard side flap was missing. since the system had never been taken apart prior to my tinkering, i can only assume that flap is still hangin around in there somewhere.
~a |
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