Upper Coolant Pipe

The Upper Coolant Pipe is an aluminum hard pipe which carries coolant from the engine block to the radiator (via the upper radiator hose).

The upper coolant pipe with both coolant temp sensors. Viewed from the engine-side.

Function

The Upper Coolant Pipe carries water from the heads (the two ports on either side) and the thermostat housing to the radiator. It also contains ports for the two coolant temp sensors.
The main outlet port is 52mm in diameter.