Combi-valve, checking

WARNING: This page is about a different car, the 2004 Volkswagen R32. However, it is still accessible from the selected car via links, so may be relevant.

Special tools, testers and auxiliary items required

Fig 1: Hand Vacuum Pump VAS 6213

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Hand vacuum pump VAS 6213

Test conditions

Vacuum lines and hose connections free of leaks
Vacuum lines not blocked or kinked

Test sequence

Fig 2: Hand Vacuum Pump Connected To Vacuum Hose From Combi-Valve

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Pull off vacuum hose at combi-valve - 1 -.
Connect hand vacuum pump VAS 6213 to vacuum hose from combi-valve - 1 -.

NOTE:

Do not use compressed air during following check!

Fig 3: Locating Pressure Hose To Combi-Valve At Connection

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Detach pressure hose to combi-valve at connection - arrow - and pressurize slightly by blowing into hose. Combi-valve must be closed.
Operate Hand vacuum pump VAS 6213. Combi-valve must open.

If combi-valve does not open:

Replace combi-valve.