My friend has a 2005 Wrangler and is experiencing excessive HOT AIR into the cabin. He confirmed the source of the heat was not from the heating system. Upon further inspection he observed a 2 1/2 - 3 1/2" hole just under the dash, slightly left of the center console on the firewall. The hole looks like it should be there and not done as part of a modification. He plans on sealing it up with some aluminum tape, but would like to know if it serves a purpose or if it should be plugged? Any help is appreciated.
BTW, couldn't find anything during a search.