Just found this forum. Just bought a used 2017 Sierra 1500 5.3L and same exact noise on driver side of engine - got same run around from dealer saying it’s normal.
Took to another dealer who recorded the noise and said 95% sure it’s water pump, $650 later it’s still makin the noise . I’ll deal with service writer tomorrow and refuse card change if I have to.
But has Anyone gotten this identities yet??
There’s 8 years of posts here and no resolution found.
Anyone??