GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 38185 Hose Clamp Pliers

Removal Procedure


    Object Number: 70064  Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  2. Remove the air cleaner intake duct. Refer to Air Cleaner Inlet Duct Replacement in Engine Controls - 3.1L.
  3. Remove the LH engine mount strut. Refer to Engine Mount Strut Replacement in Engine Mechanical - 3.1L.
  4. Remove the spark plug wires from the left bank. Refer to Spark Plug Wire Replacement in Engine Controls - 3.1L.
  5. Use the J 38185 in order to reposition the hose clamp from the water outlet housing.
  6. Remove the upper radiator inlet hose from the water outlet housing.

  7. Object Number: 466875  Size: SH
  8. Remove the heater outlet hose (2) from the thermostat bypass pipe.
  9. Remove the throttle body inlet and outlet hoses (1) from the thermostat bypass pipe.

  10. Object Number: 54419  Size: SH
  11. Remove the thermostat bypass pipe nut.

  12. Object Number: 187083  Size: SH
  13. Use the J 38185 to reposition the hose clamp from the thermostat bypass pipe.
  14. Remove the thermostat bypass pipe hose from the pipe.

  15. Object Number: 187084  Size: SH
  16. Remove the thermostat bypass pipe bolt.
  17. Remove the thermostat bypass pipe.

Installation Procedure


    Object Number: 187084  Size: SH
  1. Install the thermostat bypass pipe.
  2. 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.

  3. Install the thermostat bypass pipe bolt.
  4. Tighten
    Tighten the bolt to 11 N·m (98 lb in).

  5. Install the thermostat bypass hose to the pipe.

  6. Object Number: 187083  Size: SH
  7. Use the J 38185 to reposition and install the hose clamp to the thermostat bypass pipe.

  8. Object Number: 54419  Size: SH
  9. Install the thermostat bypass pipe nut.
  10. Tighten
    Tighten the nut to 25 N·m (18 lb ft).


    Object Number: 466875  Size: SH
  11. Install the heater outlet hose (2) to the thermostat bypass pipe.
  12. Install the throttle body inlet and outlet hoses (1) to the thermostat bypass pipe.

  13. Object Number: 70064  Size: SH
  14. Install the radiator inlet hose to the water outlet housing.
  15. Use the J 38185 to reposition and install the hose clamp to the water outlet housing.
  16. Install the spark plug wires to the left bank. Refer to Spark Plug Wire Replacement in Engine Controls - 3.1L.
  17. Install the LH engine mount strut. Refer to Engine Mount Strut Replacement in Engine Mechanical - 3.1L.
  18. Install the air cleaner intake duct. Refer to Air Cleaner Inlet Duct Replacement in Engine Controls - 3.1L.
  19. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.