Take a look at both the bottle and the Y connection on the coolant hose on the passenger side of the motor. My 12 had a crack in the bottle, as well as a leak at the plastic Y connector. You can't replace just the Y connection as it's part of the hose. The whole hose is huge and snakes around to the back of the motor from the coolant bottle. I ended up cutting the hose before the connector and splicing in a length of the same hose (including new Y connector) I got from the junkyard.
2012 Focus SE 5MT, ingot silver metallic. Window tint, focal wheels, lots of chrome bits.