Diagram for 4-wheel drive under hood to the transfer case vacuum switch needed

2003 CHEVROLET BLAZER
175,000 MILES • 4.3L • 6 CYL • 4WD • AUTOMATIC
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BRYNJA ULLRICH
  • MEMBER
  • 1 POST
All vacuum lines were missing when I bought the car.
Nov 28, 2021 at 5:20 AM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi,

Are there no vacuum hoses whatsoever? I'm surprised it was running. LOL Regardless, I attached vacuum schematics for the EVAP system and the 4wd system. For some reason, the 4wd schematic is somewhat vague.

Take a look through them and let me know if you have questions. I'll try my best to help from here.

I hope this helps.

Take care,

Joe

See pics below.
Nov 28, 2021 at 12:55 PM
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