After a 2 hr or so drive today... I parked my teg and noticed a weird sound coming from under the hood. Went to investigate and a boiling sound was coming from the left side where the coolant reservoir is. Checked the reservoir and it still had coolant. Checked the radiator later and it was kinda empty. Over the left side of the engine, there was coolant spilled over it.

The car did not overheat at all, and it still does not. I just started the car again after 2 hrs and it seems to be fine. I cranked the heat all the way up and no hot air comes out. I'm very worried about whats going on, someone please? Thanks...