Quote:
Originally posted by mthomas58
Have been thinking about sealing the floorboard since the last post to keep air from leaking out behind the floorboards. Pulled top floorboard up today to do some checking and there was qite a bit of air leaking out from behind the floorboard particulary around the mass of wires on the left and top. Stuffed some paper towels in at the leaks temporarily to test. Significant reduction in air escaping. Will monitor system for any performance improvements. Still waiting for a really hot day to arrive here in Atlanta. 
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Quick update: sealing up the floorboard proved to be a bad idea....car did not cool as well (significantly). I think the reason is that the floorboard fan CFM is less than the A/C blower thereby restricing airflow and efficiency at high speed (without the ability to pull from the sides as needed).
It was about 80 today here in Atlanta. With the floorboard sealed, I could not get vent temps much below 40. Pulled the paper towel insulation and vent temps got down to 36 in a couple of minutes.