The yellow port goes to a vacumm line that goes to the intake air bypass valve on top of the water port on the front of the head to help with the injector fuel flow while the engine is cold. the green goes to a hose that attaches to the port on the water pump housing.I have another question in reference to this.
I have 3 open ports on my engine but I dont know where they go.
1 of them appears to be right off my waterpump (not shown)
1 of them is circled yellow
1 of them is on the other side of the green circle, where do they all go?