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It’s something that comes and goes and is just a portly designed cooling system and the issue will eventually come back. Bleed the system and keep it like 5% above the recommended capacity and it should go away for a while and not be as frequent. Just my opinion and what I did for mine, it didn’t get rid of it but it dramatically reduced how often it happens.
 
I heard water sloshing once......30 minutes late I smelled coolant and my windows were fogging up.
Solution, new heater core and front carpet as the coolant soaked my carpeting.

2020 Canyon Denali 14000 miles. Just picked it back up from the dealer.
 
When I apply the accelerator i hear the sound of water flowing behind the passenger side dash. Like where the heater core is. I thought it may be air in the system so I burped the system. Has anyone else experience this?
Yes, i am having problems with this issue while the dealer is acting like they do not know what is happening....
 
Yes, i am having problems with this issue while the dealer is acting like they do not know what is happening....
Have you read the 9 pages of posts here? You might find a solution in this: Fill the reservoir, I suggest about an inch over the actual fill line, and drive it a while. The sound will go away typically.
 
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