Sound actually started back in 2017, had it diagnosed and SA said it was a vacuum hose had a leak. Never really had it changed since then. Only comes on when engine is hot, idling(at least that's the only time I hear it, it maybe be sounding while driving too but hard to tell with all other noise). Well, I finally got the vaccumm line replaced. Sure enough, sound is still there. Any ideas what it is? Reading some stuff that it could be water pump? Any ideas are welcomed.
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