Is it my head gasket

Chevrolet Aveo 2012 Hatchback  69000 miles
When car reaches temperature, water is bubbling back into expansion tank and being forced out the overflow.
Sent a video of it to my mechanic. He thinks gasket but never actually examined the car. I have a video of whats happening
Vonnie from United Kingdom 2 years ago  
VO
2 reports 
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