Jeep Grand Cherokee Limited
VW Golf
Plumbing

If water is already running what causes it to stop and then start again?

Answer

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Wiki User
09/12/2011

If you get a clunky knocking noise from the pipes of your water system it is air-lock, like an air bubble in the pipes. The only way to get rid of it is to let the water run or if you have bleed-points bleed it (put an old towel down first) It is common for this to happen if you have turned the water off or drained the system for maintainance.