Pic. 2.185. Checking the pressure reducing valve in the expansion tank cap
Install the cooling system tester with cooling system adapter on the cover (pic. 2.185).
Use the tester's hand pump to create an overpressure of max. 1.6 bar.
The pressure relief valve must remain closed.
Premature opening of the pressure reducing valve
Replace cover.
Raise the pressure above 1.6 bar.
The relief valve should open.
If the relief valve does not open, replace the cap.
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