The main outlet for the HVAC is dead center of the dash, directly behind the radio. The main duct line is held in place with two "nuts" that screw onto plastic stems, and 2 push-in christmas tree type retainers. There is a strip of foam that goes between the HVAC module and the duct, but I've noticed having mine apart that (a) the foam comes loose with age and (b) sometimes the duct work just doesn't seat right. In retrospect I think this was probably my issue with water dripping into the radio when I run the A/C. The dealer told me it was condensation dripping off the duct where it routes over the radio, but my guess now is that it was actually blowing the air directly into the radio causing it to sweat. You may be able to see it by removing the radio, but I'm not positive. Fixing it would require removing the dash shell and sealing it up. When I put mine back together, I wrapped some duct wrap insulation and foil tape around the joint.
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