Checking Function Of Reservoir Cap

Information 

The lid has a two-stage design and as a result, two test steps are required.

1. Screw on the cap -1-  using adapter 65 -2-  .
   1. 1.1. Then, connect it to cooling system tester WE 1069 -3-  and hose adapter FZ 100K  .
      Fig 1: Checking Reservoir Cap For Leaks Using Tester 1069 With Adapter

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Test step for stage 1: 

2. Build up overpressure.
   1. 2.1. The first stage opens at an overpressure of approx. 1.3 bar. The pressure then slowly drops again and the valve closes at 1.0 bar. If the pressure drops further, replace the cap.

      Test step for stage 2 if the minimum pressure in stage 1 is maintained: 

3. Apply overpressure to the valve of step  1 by pumping rapidly. The valve of step  2 must open at an overpressure of approx 1.8 bar.
   1. 3.1. If the valve does not open, replace the cap.