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Just remembered, there are drains for the upper part of the plenum. This got plugged (IIRC the drains have small rubber flaps moded to them, and the car hardly ever saw rain, the the little flaps sort of fused together and water would back up into the plenum/cowl area pretty bad). Anyways, the water backed up bad enough that it ran into the air intake itself, and into the heater/AC box and dripped onto the floor. Normally not a problem getting a little water into the air intake, but they got into some realy heavy rain on a trip and carpets were getting a little damp.
Cleaned out these cowl drains and opened the small flaps and that fixed it.
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