I have been trying to diagnose a plumbing noise problem with no success and would appreciate some more seasoned advice.
When I open the upstairs bathroom sink cold water faucet just a little I get a strong loud vibrating sound. It goes away as I increase the water flow.
No problem with the hot water faucet or downstairs faucets (hot and cold). I first thought it a hammer problem but that supposedly only happens on closing faucets and anyway I did bleed the system to all air back into the air chambers. But this ghoulish noise persists.
Pointers much appreciated. Thanks.
Christopher Oakland, CA