My car seems to be running very hot the temp gauge reads high but when the car was at the rolling road they said it was the wrong one.

I took the car out today and you could burn your hand on the slam panel. I cracked open the expantion tank lip and there was a lot of bubbles coming from the small hose at the top. The level also raised by a couple of inches. Does this look like a problem or am I paranoid?

Cheers