That is coolant leaking. It's those cheap plastic Ys. Not fixing this soon could cause you to overheat and blow your head gaskets.
You can get 2 of the Dorman 47238HP and replace them with metal ones, or get the full heater hose assemblies which are Dorman 626-315HP.
You can get 2 of the Dorman 47238HP and replace them with metal ones, or get the full heater hose assemblies which are Dorman 626-315HP.