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2. Pump the cooling system up to an excess pressure of
1.3 bar
. If the pressure decreases, locate the leak and remedy the fault. Check pressure relief
valve(s) in the cap. Screw the tester, adapter and cap together.
Test, two-step cap
Part number 996 106 447 00
1. Generate excess pressure (step 1)
2. The pressure relief valve opens at an excess pressure of
approximately 1.4 bar
; the pressure then slowly decreases again, and the valve closes at
1.0 bar
. If the pressure decreases further, replace the cap.
3. If the test pressure of step 1 is maintained, test step 2. Apply excess pressure to the pressure relief valve of step 1 by pumping rapidly. The
pressure relief valve of step 2 must open at an excess pressure of
approximately 1.8 bar
. If the valve does not open, replace the cap.
This is a source reference. Confirm exact model applicability in the original material.