Coolant Bypass Valve Replacement 4.3L, 4.8L, 5.3L, 6.0L

Special Tools

J 38185 Hose Clamp Pliers

1. Remove the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement .



2. Drain the engine coolant. Refer to Cooling System Draining and Filling .
3. If equipped with 4.8L, 5.3L or 6.0L; remove the engine cover. Refer to Engine Cover Replacement
4. Remove cowl water drain nuts.
5. Remove cowl water drain.
6. Remove the heater inlet hose clamp and the heater outlet hose clamp from the heater core.
7. Remove the upper heater inlet hose and the upper heater outlet hose from the heater core.
8. Remove the lower heater inlet hose clamp and the lower heater outlet hose clamp from the outlet of the coolant bypass valve (4) using the J 38185 .
9. Remove the lower heater inlet hose and the lower heater inlet hose from the inlet of the coolant bypass valve.
10. Remove the vacuum hose from the coolant bypass valve.

1. Install the coolant bypass valve (4).
2. Install the vacuum hose to the coolant bypass valve.
3. Install the lower heater inlet hose and the lower heater outlet hose to the inlet of the coolant bypass valve (4).
4. Install the lower heater inlet hose clamp and the lower heater outlet hose clamp to the inlet of the coolant bypass valve using the J 38185 .
5. Install the upper heater inlet hose and the upper heater outlet hose from the heater core.
6. Install the heater inlet hose clamp and the heater outlet hose clamp from the heater core.
7. Install cowl water drain.
8. Install cowl water drain nuts.
9. If equipped with 4.8L, 5.3L or 6.0L; install the engine cover. Refer to Engine Cover Replacement
10. Fill the cooling system. Refer to Cooling System Draining and Filling .
11. Install the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement .

Coolant Bypass Valve Replacement 6.6L

Special Tools

J 38185 Hose Clamp Pliers

1. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
2. Remove the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement .
3. Remove the accumulator. Refer to Air Conditioning Accumulator Replacement .
4. Remove the vacuum hose from the coolant bypass valve.



5. Drain the engine coolant. Refer to Cooling System Draining and Filling .
6. Reposition the heater inlet hose clamp and the heater outlet hose clamp from the coolant bypass valve using the J 38185 .
7. Remove the heater inlet hose and the heater outlet hose from the coolant bypass valve.



8. Reposition the heater inlet hose clamp and the heater outlet hose clamp from the heater core using the J 38185 .
9. Remove the heater inlet hose and the heater outlet hose from the heater core.
10. Remove the coolant bypass valve assembly from the vehicle.

1. Install the coolant bypass valve assembly to the vehicle.
2. Install the heater inlet hose and the heater outlet hose to the heater core.
3. Reposition the heater inlet hose clamp and the heater outlet hose clamp to the heater core using the J 38185 .



4. Install the heater inlet hose and the heater outlet hose to the coolant bypass valve.
5. Reposition the heater inlet hose clamp and the heater outlet hose clamp to the coolant bypass valve using the J 38185 .
6. Install the vacuum hose to the coolant bypass valve.
7. Install the accumulator. Refer to Air Conditioning Accumulator Replacement .
8. Fill the cooling system. Refer to Cooling System Draining and Filling .
9. Install the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement .
10. Install the air cleaner. Refer to Air Cleaner Assembly Replacement .