Vacuum Diagrams: Introduction

This article contains underhood views or schematics of vacuum hose routing. Vacuum diagrams are an excellent tool for identifying improperly routed vacuum hoses. Improperly routed vacuum hoses cause driveability and computer-indicated malfunctions.

Fig 1: Vacuum Diagram EGR System (EuroVan: 2.5L 5 Cyl.)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig 2: Vacuum Diagram EVAP System (EuroVan: 2.5L 5 Cyl.)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig 3: Vacuum Diagram Intake Manifold (EuroVan: 2.5L 5 Cyl.)

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Fig 4: Vacuum Diagram Secondary Air Injection System (EuroVan: 2.5L 5 Cyl.)

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Fig 5: Vacuum Diagram EGR System (Golf III & Jetta III)

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Fig 6: Vacuum Diagram EVAP System (Golf III & Jetta III)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig 7: Vacuum Diagram & Motronic System (Corrado SLC & Passat)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig 8: Vacuum Diagram EVAP System (Corrado SLC & Passat)

Courtesy of VOLKSWAGEN UNITED STATES, INC.