 Flapper in heater fan, What does it do ? |
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| Olympic 914 |
 Jul 3 2017, 07:46 AM
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#1
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 Group: Members Posts: 1,680 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States 
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The heater fan motor was pretty cruddy so I disassembled it and polished the armature and greased the ends then bench tested it and it ran pretty good. loosened the bolts on the housing and while it was running wiggled it around a bit until it ran the smoothest. when I reassembled it I noticed a clear plastic flapper inside the blower housing. No spring on it to hold it closed. When I put the fan in the car with the outlets pointed in what looked to be the best direction, pointing towards the pass side, the flapper valve hung open.
Looked at the "originality photos" and see that the outlet was installed to point straight up (?) in this position the flapper closes by gravity and would open whenever the fan is blowing. What does this flapper do ? |
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| BeatNavy |
Jul 3 2017, 08:21 AM
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#2
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Certified Professional Scapegoat Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region
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Or maybe to keep the engine fan from pulling hot air out of the heat exchangers into the engine bay (IMG:style_emoticons/default/confused24.gif)
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| malcolm2 |
Jul 3 2017, 09:35 AM
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#3
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Advanced Member Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States
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QUOTE(BeatNavy @ Jul 3 2017, 09:21 AM)  Or maybe to keep the engine fan from pulling hot air out of the heat exchangers into the engine bay (IMG:style_emoticons/default/confused24.gif) I hear that that is what the flappers on the engine fan do. But if gravity is holding down this flapper, I suppose HE air could make it's way to the engine bay if the flapper was not there. Probably more of a chance that would happen than my "stuff" idea. Cause where is the "stuff" going to go if it is sitting on top of the flapper. (IMG:style_emoticons/default/confused24.gif)  |
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Posts in this topic
Olympic 914 Flapper in heater fan Jul 3 2017, 07:46 AM
malcolm2 My guess is that it keeps "stuff" out of... Jul 3 2017, 08:17 AM rhodyguy Outlets, plural? Are you using an early fan? Jul 3 2017, 08:26 AM
Olympic 914
Outlets, plural? Are you using an early fan?
Or... Jul 3 2017, 08:59 AM rhodyguy Your car should have a single outlet fan with a sp... Jul 3 2017, 09:16 AM McMark Factory diagrams show the fan outlet pointing damn... Jul 3 2017, 01:01 PM Olympic 914
Factory diagrams show the fan outlet pointing dam... Jul 4 2017, 06:56 AM McMark Here's all I see in the manuals:
AND
It's ... Jul 4 2017, 07:52 AM Spoke When the heating fan is not on, the engine cooling... Jul 4 2017, 08:44 AM |
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