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Cowl Drain Valve

Rapid Red

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Think we are all thinking the same here. Is the area exposed in such away as to have water splash in from the outside?

How does the water drain, or is channeled overboard ? Hard to imagine, get a chance post a photo.

This is very curious in a fun way, I am on the same page, no effect. Hell for 3 - 4 bucks nothing to loose.

Pep
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DavisCustoms

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the reason behind the flapper drain on the cowl is actually to keep exhaust gases (and other engine fumes/fluids etc) from entering the cowl area due to your A/C pulling fresh air from the cowl area when you select the Fresh Air (non recirculating) setting on your A/C panel. hence why the valve is of a one-way design, water can drain thru but gases/fluids cannot flow into the cowl and contaminate the air going into the cabin.
 
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Rapid Red

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Good one ! however, I think any possible fumes from that source. Would be no worse then then the rotten egg smell, and some of the rest that get in from any fresh air drawn.

For the most part run the AC closed to outside air, still smell stinky beaters & oil burners. I understand the point of the flapper, and educated regarding its purpose. Just not sold on the idea it really cures the problem.

Thanks for posting, learned.
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DavisCustoms

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I leave mine on recirculate all the time, however, when you select defrost, the A/C will switch from recirculate to fresh air automatically. (all cars, not just Mustangs/Fords)
hence why the fresh air intake is in the cowl, with the cowl intake facing upwards/outwards so exhaust gases that would naturally get trapped under a car when stopped will not be sucked in via the fresh air intake, but the drain allows water (from condenser and rain)(by virtue of the weight of the water) to pass thru then closes back tightly to prevent noxious gases to flow into the cowl.
 
 




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