Quote:
Originally Posted by Brookshire my
I just looked underneath and there is one larger and one smaller hole on each side where hot air is released under the engine. Also the flaps that must help sweep the hot air rearward. 
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You're missing a tube on that large hole. Like Greg said, it sends the cabin heat forward, but it needs to be connected to the heat exchanger to do this.
The small hole directly above is the drain plug for the left side hell hole.