![2004 Blazer 4WD LS, 29K miles. No forced air (hot or cold) coming through floor vents. Dash & defrost vents work fine. 2004 Blazer 4WD LS, 29K miles. No forced air (hot or cold) coming through floor vents. Dash & defrost vents work fine.](https://ww2.justanswer.com/uploads/GM/GMGreatWrench/2013-01-23_033936_blazer_vacuum_lines.jpg)
2004 Blazer 4WD LS, 29K miles. No forced air (hot or cold) coming through floor vents. Dash & defrost vents work fine.
![Chevy S10, S15, and GMC Sonoma Pick-Ups 1982-1993 Repair Manual Vacuum Diagrams Repair Guide - AutoZone Chevy S10, S15, and GMC Sonoma Pick-Ups 1982-1993 Repair Manual Vacuum Diagrams Repair Guide - AutoZone](https://www.autozone.com/znetrgs/repair_guide_content/en_us/images/0996b43f/80/21/13/e3/large/0996b43f802113e3.gif)
Chevy S10, S15, and GMC Sonoma Pick-Ups 1982-1993 Repair Manual Vacuum Diagrams Repair Guide - AutoZone
WHEN I SHIFT THE PTO INTO 4 HIGH THE LIGHT COMES ON BUT THE FRT AXLE IS NOT DRIVING, ONLY THE REAR AXLE?
SOLVED: Vacuum system for the 4x4 transmission/ transfer case & differential? - 1983-1994 Chevrolet Blazer - iFixit
![Amazon.com: Transfer Case Vacuum Switch for Chevy S10 Blazer GMC Sonoma Olds Bravada 4WD 4x4 : Automotive Amazon.com: Transfer Case Vacuum Switch for Chevy S10 Blazer GMC Sonoma Olds Bravada 4WD 4x4 : Automotive](https://m.media-amazon.com/images/I/51V34umaikL.jpg)
Amazon.com: Transfer Case Vacuum Switch for Chevy S10 Blazer GMC Sonoma Olds Bravada 4WD 4x4 : Automotive
![4.3 vortec 2001 Chevy blazer can anyone tell me where this vacuum line is supposed to connect to : r/MechanicAdvice 4.3 vortec 2001 Chevy blazer can anyone tell me where this vacuum line is supposed to connect to : r/MechanicAdvice](https://i.redd.it/il1qc8wb3hl31.jpg)