 Part Question, Impeller Flapper ?? |
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| jim_hoyland |
 Sep 1 2008, 07:52 PM
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#1
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Get that VIN ?  Group: Members Posts: 9,328 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California 
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How important is this part ? I noticed it's missing from my new fan housing and the current one lacks it too.
There's a nice pic of it on page 178 AA Catalog... |
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| Bartlett 914 |
Sep 1 2008, 09:28 PM
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#2
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Advanced Member Group: Members Posts: 2,216 Joined: 30-August 05 From: South Elgin IL Member No.: 4,707 Region Association: Upper MidWest |
When the engine is idling, there is less air available for the cabin. The electric fan is used to boost the airfllow. The flappers act as check valves so the electric fan can provide more air.
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| jim_hoyland |
Sep 1 2008, 10:02 PM
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#3
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Get that VIN ? Group: Members Posts: 9,328 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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QUOTE(Bartlett 914 @ Sep 1 2008, 08:28 PM)  When the engine is idling, there is less air available for the cabin. The electric fan is used to boost the airfllow. The flappers act as check valves so the electric fan can provide more air. So they are closed at idle, or does the flow from the fan close them ? |
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| davesprinkle |
Sep 1 2008, 10:55 PM
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#4
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Senior Member Group: Members Posts: 720 Joined: 13-October 04 From: Berkeley, CA Member No.: 2,943 Region Association: None
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QUOTE(jim_hoyland @ Sep 1 2008, 09:02 PM) QUOTE(Bartlett 914 @ Sep 1 2008, 08:28 PM) When the engine is idling, there is less air available for the cabin. The electric fan is used to boost the airfllow. The flappers act as check valves so the electric fan can provide more air. So they are closed at idle, or does the flow from the fan close them ? Jim, The flappers close off the fan housing when engine speed is low. This prevents air from the electric fan from escaping into the fan housing. As engine speed climbs, the higher pressure in the fan housing forces the flaps open. |
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Posts in this topic
jim_hoyland Part Question Sep 1 2008, 07:52 PM
r_towle keeps the mice out.
Rich Sep 1 2008, 08:19 PM
rhodyguy jim, which side do you need? l or r? is the pin it... Sep 2 2008, 08:15 AM
jim_hoyland Thanks for the info; now I know why the electric f... Sep 2 2008, 08:51 AM |
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