Coolant leak hmmmm

I have a tiny coolant leak in the upper engine area.

Two year ago I replaced the water pump, the radiator, the upper hose, and the lower hose.

I did not replace the heater hoses. So a few weeks ago I replaced the upper heater hose/intake hose. I thought that would fix the leak.

Nope.

So I am going to replace the lower hose and see if that fixes it?

It's just a pin hole size amount of coolant that sometimes shoots up onto the hood and then hits the fan and splatter around.

What else could it be.

Thermostat housing, heater hose, water pump?

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All I have left to replace is the return heater hose, so that has been ordered and replaced on Wed.