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That would be the 1st guess.
But i would 1st look at the serpentine belt.
It may be old and glazed. .... thus slipping on the pulleys.
The tensioner may be weak too.
 

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When was the last time you replaced the serp. Belt?

 

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Check the fluid level too
 

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Enclaves are notorious for water pumps if has metal chips in fluid figure on a rack also. This is a big job 8-10 hours. I had a 2016 same thing plus trans went also. Shame is Buick had to knew of these issues for many years and did nothing to fix problems. I will not support a company like that anymore. I traded mine in on a quality Subaru outback.
 
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