Engine Coolant Crossover Pipe Replacement LA3, LY9

1. Partially drain the cooling system. Refer to Cooling System Draining and Filling .
2. Remove the intake manifold. Refer to Intake Manifold Replacement in Engine Mechanical-2.6L and 3.2L.



3. Disconnect the electrical connector (3) from the engine coolant temperature (ECT) sensor.
4. Disconnect the throttle body heater hose (1) from the fitting.



5. Remove the following from the cylinder heads with the heater hose (3) still attached:

•	The water crossover fittings (2)

•	The upper and lower seals (1)

•	The water crossover (4)

6. Disconnect the heater hose (3) from the water crossover (4) if replacement is necessary.



7. Remove the following components from the water crossover (1) if replacement is necessary:

•	The water crossover pipe plug (2)

•	The ECT sensor (4) and gasket (5)

•	The throttle body inlet heater hose fitting (3)

Notice: Refer to Component Fastener Tightening Notice in the Preface section.




1. Install the following components to the water crossover (1) if previously removed:

•	The ECT sensor (4) and gasket (5)

Tighten
Tighten the ECT sensor to 18 N·m (13 lb ft).

•	The throttle body inlet heater hose fitting (3)

Tighten
Tighten the throttle body inlet heater hose fitting to 20 N·m (15 lb ft).

•	The water crossover pipe plug (2)

Tighten
Tighten the water crossover pipe plug to 5 N·m (44 lb in).

•	The heater hose




2. Install the following to the cylinder heads:

•	The upper and lower seals (1)

•	The water crossover (4)

•	The water crossover fittings (2)

Tighten
Tighten the water crossover fittings to 20 N·m (15 lb ft).




3. Connect the electrical connector (3) to the ECT sensor.
4. Connect the throttle body heater hose (1) to the fitting.
5. Install the intake manifold. Refer to Intake Manifold Replacement in Engine Mechanical-2.6L and 3.2L.
6. Fill the cooling system. Refer to Cooling System Draining and Filling .