I have an 02 Chevy Impala with about 135,000 miles. The a/c is not blowing through the console vents. The floor vents and the windshield vents still blow cold. The air recirculate button doesn; t work and does not light up, only fresh air comes in. I did hear a clunk sound on the right side when teh air stopped blowing. Is this a blown fuse, relay or a blockage?