Cooling system, checking for leaks

Fig 1: Identifying Special Tools - Cooling System, Checking For Leaks

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Special tools, testers and auxiliary items required

Test conditions

Test sequence

CAUTION: Cover cap of expansion tank with rag and open carefully, as hot steam or hot coolant may escape when opening.

Fig 2: Attaching Cooling System Tester V.A.G 1274 With Adapter V.A.G 1274/8 To Expansion Tank

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Attach cooling system tester V.A.G 1274 with adapter V.A.G 1274/8 to expansion tank.
Generate a positive pressure of approx. 1.0 bar using hand pump of cooling system tester.
If pressure decreases, search for leaking areas and repair malfunction.

Pressure relief valve in cap, checking

Fig 3: Checking Pressure Relief Valve In Filler Cap

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Attach cooling system tester V.A.G 1274 with adapter V.A.G 1274/9 to expansion tank cap.
Operate hand pump.