What is hose connected to? Does it go to the firewall? Or somewhere else? If it goes to the firewall, then that would be a heater core hose, and the core could have gotten clogged with rust, dirt, and debris. I would take both of those hoses off from the engine side, connect my water hose to the hose that is not leaking, point the other somewhere where it will not get anything important wet (maybe into a bucket or something), and turn the water hose on with low pressure. That will push the crud out slowly if that is the problem.
Also, if you have not ever changed the clamps on the cooling system hoses, it might be time to do that. Over the years they stretch just a little and become weaker, causing little leaks kind of like this.
Let us know.
Wednesday, September 13th, 2017 AT 3:24 AM