Cooling system, checking for leaks

NOTE: Engine must be at operating temperature.

Fig 1: Installing Tester VW 1274 With Adapter VW 1274/1 On Expansion Tank

Courtesy of AUDI OF AMERICA, INC.

Install tester VW 1274 with adapter VW 1274/1 on expansion tank.
Build up pressure of approx. 1.0 bar with hand pump on tester. If pressure does not hold, locate and repair leaks.