Recently, air stopped blowing from my upper vents, so I'm going to remove the doghouse and dive in later today. Does a vacuum routing diagram exist anywhere? Maybe from the service manual? Can you buy that thin plastic vacuum line in bulk (like off a spool) from a parts store or do you have to get the GM stuff?
By the way, has anybody managed to fix the issue with the driver side floor vent getting almost nothing, and the passenger side cooking?