Fluid Pouring Out of the Van!

Yesterday after I got home from picking up Aidan at pre-school, fluid was pouring out of the van and running down the driveway. I popped the hood to see what was going on and found coolant fluid pouring out of an escape valve on the coolant fluid container. It continued to do that for several minutes. The van as been fine since this incident, it isn’t running hot and hasn’t leaked anymore fluid. So, I’m hoping it was just some freaky thing due to it being hot yesterday.