Clacking noise when coolant is low

2001 CHEVROLET 1500
288,457 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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JAY DOUG
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  • 1 POST
There's a loud clacking noise and when I put antifreeze in it quiets down. It's only loud when my coolant is low.
Dec 9, 2021 at 4:03 PM
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JACOBANDNICKOLAS
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Hi,

Is the noise coming from under the hood? Also, how low is the coolant when this happens? Is it loud enough for you to record and upload for me to hear?

Interestingly, the coolant is what lubricates the water pump. However, for that to be low enough to starve the pump for fluid, it's extremely low. How often do you need to add coolant?

Do me a favor. Take a look at the link below. It explains the common symptoms of a failing water pump. See if anything in it mirrors what you find or experience.

https://www.2carpros.com/articles/symptoms-of-a-bad-water-pump

Let me know.

Take care,

Joe

Dec 9, 2021 at 6:17 PM