Have you got a clearer diagram because I can't read one word on that one? Maybe it is the one that goes on the rear of the intake manifold but I can't tell from that diagram.
Did anyone find out where it goes? Mine currently has a split pin in it to block the hose which i noticed while changing the spark plugs last night. The car was overheating and leaking at one stage to which it went in and had the water pump changed as well as the thermostat replaced. It no longer leaks or overheats but the heater in the car takes a long time to get warm.
The picture shows it to be related to the heater saying its the "heater control hose vacuum supply" on the right hand side of the Tee piece, but doesnt state where the other side goes to