Cooling system, checking for leaks: Notes

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

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Special tools, testers and auxiliary items required

Cooling system tester V.A.G 1274
Adapter V.A.G 1274/8
Adapter V.A.G 1274/9

Test conditions

Engine at operating temperature.

Test sequence

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

Open cap of coolant expansion tank.

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

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Position cooling system tester V.A.G 1274 with adapter V.A.G 1274/8 on expansion tank.
Generate a positive pressure of approx. 1.0 bar using hand pump of cooling system tester.

If pressure drops:

Search for leaking areas and repair malfunction.