86 Turbo with a chatter under the passenger head light. Poked my head under and there is a small diameter hose that was pulsing out some air. And now my air conditioner will stop working whenever I make 0 + pounds of pressure. When under vacuum it runs fine. I'm guessing they're related. Maybe not. I'm obvisously not familiar with a/c systems. Any ideas on the pulsing air? Thanks.