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I have a 99 Yukon that will not switch the air (or even heat) to the dashboard vents. It switches fine from floor to defrost positions, but when I turn it to the dashboard position, no air comes out and I can hear loud "air flowing" noise (especially when the air is on max) coming from all parts of the dash. It's almost like air is flowing all throughout the dash, but not through the vents on the dashboard. Any ideas?