TAOS VW 2024 Overheating problem

Hello to everbody, hope everyone is doing great.

First post here.

I´m sorry, I just had a problem in my TAOS VW 2024 (Brand New, just 19,000-20,000km around). On Friday I tried to turn on the AC, and I noticed it didn't work really well, so I tuned it off. After that, at the 2km the "overheating" symbol turn on, since I was in a really busy avenue I kept driving for a kilometer and I turned it down, after that, I turned it on again, and it didn't show anything again, but at the 800m it showed again. I parked and I refueled the truck with coolant (I noticed it was and the minimum) but then the truck started to sound weird.

I didn´t move the truck till Sunday where I filmed this video, today (Monday) I drove until the dealership/authorized VW service center (for Mexicans "la agencia) it was a 8km ride or 40min because the traffic, I didn't rise the temperature again (just at the mid level like always) and the engine didn't work weird, just as normal as always.

The mechanic told me that it was needed a diagnosis but since the temperature rose to 297 degrees (I didn't ask if it was celsius or Fahrenheit) maybe the warranty won't apply in this case for "wrong use", the mechanic also told me that for a first sight (he checked the engine) nothing seems wrong.

Im worried about this, what could it be the problem?? it is expensive???

Extra: When I turned the AC the truck had a little vibration.

Thanks to everyone, blessings.