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.

NOTE: Always refer to Emission Control label in engine compartment before attempting service. If manual and label differ, always use emission label vacuum hose routing.

NOTE: Manufacturer is not specific about production end date for EuroVan 2.5L engine.

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

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

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

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

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

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

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

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig 5: Vacuum Diagram Connecting Piece For Intake Manifold (2.8L VR6)

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig 6: Vacuum Diagram EGR System (2.8L VR6)

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig 7: Vacuum Diagram EVAP System (2.8L VR6)

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig 8: Vacuum Diagram Fuel Pressure Regulator & Secondary Air Injection Valve (N112) (2.8L VR6)

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig 9: Vacuum Diagram Secondary Air Injection System (2.8L VR6)

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Courtesy of VOLKSWAGEN UNITED STATES, INC.