Tools Required

J 38185 Hose Clamp Pliers

1. Remove the air cleaner. Refer to Air Cleaner Assembly Replacement in Engine Controls - 4.3L.
2. Remove the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement .



3. Drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
4. Disconnect the electrical connector from the auxiliary coolant bypass valve (1).
5. Remove the vacuum hose from the auxiliary coolant bypass valve.
6. Remove the bolt that retains the auxiliary coolant bypass valve to the heater assembly.
7. Using the J 38185 , reposition the auxiliary heater inlet hose (10) clamp from the auxiliary coolant bypass valve.
8. Remove the auxiliary heater inlet hose (10) from the auxiliary coolant bypass valve.
9. Using the J 38185 , reposition the auxiliary outlet heater hose (2) clamp from the auxiliary coolant bypass valve.
10. Remove the auxiliary outlet heater hose (2) from the auxiliary coolant bypass valve.
11. Remove the auxiliary coolant bypass valve (1).

1. Install the auxiliary coolant bypass valve (1).
2. Install the auxiliary outlet heater hose (2) to the auxiliary coolant bypass valve.
3. Using the J 38185 , reposition the auxiliary inlet heater hose clamp to the auxiliary coolant bypass valve.
4. Install the auxiliary heater outlet hose (10) to the auxiliary coolant bypass valve.
5. Using the J 38185 , reposition the auxiliary heater hose clamp to the auxiliary coolant bypass valve.
6. Install the auxiliary coolant bypass valve to the heater assembly.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

7. Install the bolt that retains the auxiliary coolant bypass valve to the heater assembly.

Tighten
Tighten the bolt to 4 N·m (35 lb in).

8. Connect the vacuum hose to the auxiliary coolant bypass valve.
9. Connect the electrical connector to the auxiliary coolant bypass valve.
10. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
11. Install the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement .
12. Install the air cleaner. Refer to Air Cleaner Assembly Replacement in Engine Controls - 4.3L.