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CrossT's Avatar
 
Join Date: Jun 2002
Location: AZ
Posts: 671
Blocking Bow Tie Vent Under Dash - Question

I've capped the bow tie vent in order to increase flow through the dash vents.

It appears that the bow tie is fed directly from the AC-only plenum in the area next to the evaporator. Is is it also fed by the heaters? Or, does the heat exit undert the dash by other vents [or at all]? The manual is weak in its description.

thanks
todd
89 Targa
Old 11-07-2008, 09:55 AM
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Join Date: Oct 1999
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No. Bowtie is AC only.

There are other vents for heat/fresh air.
Old 11-07-2008, 10:10 AM
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Join Date: Jul 2001
Location: Orinda, CA
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Heat comes from the footwells - don't believe there are underdash vents
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My '85 911 Targa ** Hand painted center caps for sale here
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Old 11-07-2008, 10:26 AM
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Thanks for the confirm. Looked like the Bow Tie tube went straight to the Evaporator.

todd
89 Targa
Old 11-07-2008, 07:09 PM
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Join Date: Dec 2002
Location: San Antonio, Texas
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I doubled airflow to the center by blocking the long runs to the side vents used only for A/C with very marginal cooling effect.

Removed the ductwork on top the evaporator and blocked the side exit to the driver side vent tube.






Then under the dash I removed the long hose to the passenger side vent.



Chopped it into pieces and painted it black.

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tsuter
78 911SC Turbo Targa
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Old 11-08-2008, 07:07 AM
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tsuter's Avatar
 
Join Date: Dec 2002
Location: San Antonio, Texas
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Changed that passenger side vent routing to exit center under the dash with a three inch hose and a piece of PVC transition on the end painted black.



Now with the bow tie still in place but drilled up a bit for more airflow and a second large under dash center hose I get dramatically more air flow in the center of the cabin.

No need for spendy larger air flow fans in the evaporator box.

Plus the passenger dollies like the cold airflow at their knees. Haha its directable!
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78 911SC Turbo Targa
Thaaaats Right!!
Old 11-08-2008, 07:12 AM
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