Turn off the AC and it will stop. It's part of the venting, there are 2 or 3 of these little boxes behind the radio. You should be able to access it from the glove box
I've bought the replacement, but have not had the chance to replace it.
Chevy runs deep, don't step in Chevy.
chevy runs deep, Don't step in chevy!
289 - Holley 4150 570cfm; Performer intake; mild cam; MSD HEI; 302 heads; Roller Tips; Hedman Tri-Y headers; H-pipe w/Flowmaster 40's; 9 in posi 3.50; 205/50-17F; 225/50-17R.