1999 Chevy Express Fuse Diagram

What does vacuum mean in this fuse diagram? (1999 chevy express 1500 Chevrolet express (2001) Fuse express box chevrolet diagram 1997 engine 1999 compartment wiring info carknowledge block

What does vacuum mean in this fuse diagram? (1999 chevy express 1500

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Chevrolet express (2000) – fuse box diagram

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Chevrolet Express (2000) – fuse box diagram - CARKNOWLEDGE

What does vacuum mean in this fuse diagram? (1999 chevy express 1500

Chevrolet Express (1999) - fuse box diagram - Auto Genius