Before finally deciding to seal off the intake side of our blast ports, I
visited that exact location several times, both on the pilots and co-pilots
side. Guess what we found? Tubes not hooked to the radio rack! Same as
yours, but not previously taped on, these where just laying in there
pointing at nothing. I cable tied them up so they wouldn't get lost, then
took the side panels off and sealed up the intake ports. Our radio rack has
a couple after market fans w/tubes hooked to the rack.

I feel your pain... the co-pilots side isn't to bad. Without the brakes
pedals on that side, I can get my head up under there a long way, but the
pilots side is terrible, plus you can't get your feet out the cabin door!

Jim