Quote Originally Posted by rsportvolvo View Post
The closed loop expansion tank is a puke can for the radiator. Adding a puke can for the puke can seems silly. (added).

The euphemism "puke can" refers to a vessel that keeps expelled fluids from going into the air or onto the ground. When pressure cap on an expansion tank lets go, where do the fluids go? Ergo, how can the expansion tank be a puke can?