GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Sierra Classic - 4WD 🢒 Hybrid 🢒 Hybrid Energy Storage 🢒 Generator Control Module Coolant Tank Replacement

Removal Procedure

    Object Number: 310799 Size: SH
  1. Drain the generator control module (GCM) cooling system. Refer to Generator Control Module Cooling System Draining and Filling .
  2. Raise the hood to the service position, and perform the following steps:
    3. 2.1. Remove the ground strap from the hood.
    2.2. Remove the hood hinge bolts (1).
    2.3. Raise the hood until vertical.
    2.4. Install the hood hinge bolts until snug in the service position (2).

    Object Number: 1206680 Size: SH
  3. Reposition the GCM coolant tank hose clamp (2) from the GCM coolant tank (3).
  4. Remove the GCM coolant tank hose (1) from the GCM coolant tank (3).

    5. Object Number: 1237052 Size: SH
  5. Reposition the GCM pressure relief hose clamp from the GCM pressure relief valve.
  6. Remove the GCM pressure relief hose from the GCM pressure relief valve.

    7. Object Number: 1237056 Size: SH
  7. Remove the surge tank mounting bolts. Position the surge tank away from the GCM module.
  8. Remove the bolts (1) from the brace.

    9. Object Number: 1206674 Size: SH
  9. Reposition the GCM coolant pump inlet hose clamp (1) from the GCM coolant tank (2).
  10. Remove the GCM coolant pump inlet hose (3) from the GCM coolant tank (2).
  11. Remove the bolts from the GCM coolant tank.

    12. Object Number: 1237056 Size: SH
  12. Reposition the GCM coolant tank in order to access the GCM rear bolt.
  13. Remove the rear bolt (2) from the GCM.
  14. Remove the front bolt (3) from the GCM.
  15. Reposition the GCM in order to remove the GCM coolant tank.

    16. Object Number: 1206674 Size: SH
  16. Remove the GCM coolant tank (2) from the vehicle.

Installation Procedure

    Object Number: 1206674 Size: SH
  1. Install the GCM coolant tank (2) to the vehicle.

    2. Object Number: 1237056 Size: SH
  2. Position the GCM coolant tank in order to install the GCM rear bolt.

    3. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the rear bolt (2) to the GCM.

    4. Tighten
    Tighten the bolt to 20 N·m (15 lb ft).

  4. Install the front bolt (3) to the GCM.

    5. Tighten
    Tighten the bolt to 20 N·m (15 lb ft).

  5. Install the bolts to the GCM coolant tank.

    6. Tighten
    Tighten the bolts to 9 N·m (80 lb in).


    Object Number: 1206674 Size: SH
  6. Install the GCM coolant pump inlet hose (3) to the GCM coolant tank (2).
  7. Position the GCM coolant pump inlet hose clamp (1) to the GCM coolant tank (2).

    8. Object Number: 1237056 Size: SH
  8. Install the bolts (1) to the brace.

    9. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).

  9. Install the surge tank.

    10. Object Number: 1237052 Size: SH
  10. Install the GCM pressure relief hose to the GCM pressure relief valve.
  11. Position the GCM pressure relief hose clamp to the GCM pressure relief valve.

    12. Object Number: 1206680 Size: SH
  12. Install the GCM coolant tank hose (1) to the GCM coolant tank (3).
  13. Position the GCM coolant tank hose clamp (2) to the GCM coolant tank (3).

    14. Object Number: 310799 Size: SH
  14. Lower the hood from the service position, perform the following:
    15. 14.1. Remove the hood hinge bolts from the service position (2).
    14.2. Lower the hood to the normal position.
    14.3. Install the hood hinge bolts (1).

    Tighten
    Tighten the bolt to 25 N·m (18 lb ft).

  15. Install the ground strap to the hood.

    16. Notice: The procedure below must be followed. Improper coolant level could result in a low or high coolant level condition, causing starter/generator control module damage.

  16. Fill the GCM cooling system. Refer to Generator Control Module Cooling System Draining and Filling .