Water Passage Replacement

Remove the engine compartment covers (see ENGINE COMPARTMENT COVER REPLACEMENT ).
Drain the engine coolant (see COOLANT CHECK ).
Do the battery removal procedure (see BATTERY REMOVAL AND INSTALLATION ).
Remove the intake manifold (see REMOVAL ).
Disconnect the upper radiator hose (A), the lower radiator hose (B), the ECT sensor 1 connector (C), and the EGR valve connector (D).

Fig 1: Identifying Upper And Lower Radiator Hose, ECT Sensor Connector And EGR Valve Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect the water bypass hose (A) and the heater hose(B).

Fig 2: Identifying Water By-Pass Hose And Heater Hose
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the EGR pipe (see EGR VALVE REPLACEMENT ).
Remove the water passage (A), then remove the EGR valve (B), the ECT sensor 1 (C), and the water bypass hose (D).

Fig 3: Water Passage, EGR Valve, ECT Sensor And Water Bypass Hose With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Install the water passage with new gaskets (E) in the reverse order of the removal.
Do the battery installation procedure (see BATTERY REMOVAL AND INSTALLATION ).
Refill the radiator with engine coolant, and bleed the air from the cooling system (see COOLANT CHECK ).
Clean up any spilled engine coolant.
Install the engine compartment covers (see ENGINE COMPARTMENT COVER REPLACEMENT ).