Coolant Line/Hose: Service and Repair

Engine Coolant Crossover Pipe Replacement (LZE, LZ4, LGD)

Removal Procedure




1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement (Intake Manifold Cover Replacement) for the 3.5L engine, or Intake Manifold Cover Replacement (Intake Manifold Cover Replacement) for the 3.9L engine.
2. Remove the generator. Refer to Generator Replacement (RPOs LZE/LZ4/LGD) (Service and Repair).
3. Remove the drive belt idler pulleys. Refer to Drive Belt Idler Pulley Replacement (Service and Repair) for the 3.5L engine, or Drive Belt Idler Pulley Replacement (Service and Repair) for the 3.9L engine.
4. Remove the power steering pump. Refer to Power Steering Pump Replacement (LZ4/LZE/LZ9) (Power Steering Pump Replacement).
5. Reposition the coolant recovery reservoir hose clamp at the fill tube fitting.
6. Remove the coolant recovery reservoir hose from the fill tube fitting. Position the hose out of the way.




7. Reposition the radiator inlet hose clamp at the crossover pipe (3.5L shown, 3.9L similar).
8. Remove the radiator inlet hose from the crossover pipe.




9. Reposition the thermal bypass hose clamp at the crossover pipe.
10. Remove the thermal bypass hose from the crossover pipe.




11. Remove the coolant crossover pipe bolts (2, 3, 4).
12. Remove the coolant crossover pipe.

Installation Procedure




1. Position the coolant crossover pipe to the cylinder heads.
Caution: Refer to Fastener Caution (Fastener Caution).

2. Install the coolant crossover pipe bolts (2, 3, 4).

Tighten the bolts to 50 Nm (37 lb ft).




3. Install the thermal bypass hose to the crossover pipe.
4. Position the thermal bypass hose clamp at the crossover pipe.




5. Install the radiator inlet hose to the crossover pipe (3.5L shown, 3.9L similar).
6. Position the radiator inlet hose clamp at the crossover pipe.




7. Install the coolant recovery reservoir hose to the fill tube fitting.
8. Position the coolant recovery reservoir hose clamp at the fill tube fitting.
9. Install the power steering pump. Refer to Power Steering Pump Replacement (LZ4/LZE/LZ9) (Power Steering Pump Replacement).
10. Install the drive belt idler pulleys. Refer to Drive Belt Idler Pulley Replacement (Service and Repair) for the 3.5L engine, or Drive Belt Idler Pulley Replacement (Service and Repair) for the 3.9L engine.
11. Install the generator. Refer to Generator Replacement (RPOs LZE/LZ4/LGD) (Service and Repair).
12. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement (Intake Manifold Cover Replacement) for the 3.5L engine, or Intake Manifold Cover Replacement (Intake Manifold Cover Replacement) for the 3.9L engine.