Hummer H3. Manual — part 1101

REPAIR INSTRUCTIONS

COOLING SYSTEM DRAINING AND FILLING (STATIC FILL)

Tools Required

J 26568 Coolant and Battery Tester. See Special Tools.

J 38185 Hose Clamp Pliers.

Draining Procedure

1. Park the vehicle on a level surface.

2. Allow the engine to cool.

3. Remove the radiator cap.

4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

5. Remove the engine shield. Refer to Engine Shield Replacement .

6. Place a drain pan under the lower radiator hose connection at the bottom of the radiator.

7. Using J 38185 slide the hose clamp back on the lower radiator hose. See Special Tools.

8. Slowly remove the lower radiator hose and drain the coolant into the drain pan.

9. Inspect the engine coolant for the following:

Is the repair complete?

Go to Step 16

-

15

Replace the fan blades. Refer to Fan
Clutch Replacement.
Is the repair complete?

Go to Step 16

-

16

Operate the fan clutch to verify proper
operation.
Did you find and correct the condition?

System OK

Go to Step 2

CAUTION: To avoid being burned, do not remove the radiator cap or

surge tank cap while the engine is hot. The cooling
system will release scalding fluid and steam under
pressure if radiator cap or surge tank cap is removed
while the engine and radiator are still hot.

IMPORTANT: Draining the cooling system with the pressure cap installed

will siphon the coolant from the overflow tank.

2007 Hummer H3

2007 ENGINE Engine Cooling - H3

Discolored appearance - follow the flush procedure. Refer to Flushing.

Normal in appearance - follow the filling procedure.

If a complete block drain is required, remove the coolant heater located on the LH
side of the block. Refer to Coolant Heater Replacement.

Filling Procedure

1. If a complete block drain was required, install the coolant heater. Refer to Coolant Heater

Replacement.

2. Install the lower radiator hose.

3. Using the J 38185 slide the lower radiator hose clamp into the original position. See

Special Tools.

4. Lower the vehicle.

5. Install the radiator cap.

6. Remove coolant recovery reservoir cap.

7. Fill the coolant recovery reservoir with the remaining coolant.

8. Install coolant recovery reservoir cap.

9. Start the engine.

10. Run the engine at 2,000-2,500 RPM until the engine reaches normal operating temperature.

11. Allow the engine to idle for 3 minutes.

12. Shut the engine off.

13. Allow the engine to cool.

14. Top off the coolant recovery reservoir as necessary.

15. Inspect the cooling system for leaks.

16. Rinse away any excess coolant from the engine and the engine compartment.

17. Inspect the concentration of the engine coolant using J 26568 . See Special Tools.

NOTE:

The procedure below must be followed. Improper coolant level
could result in a low or high coolant level condition, causing engine
damage.

IMPORTANT: Slowly add a mixture of 50/50 DEX-COOL antifreeze and

deionized water to the cooling system through the top of the
radiator until full. Refer to Approximate Fluid Capacities .

2007 Hummer H3

2007 ENGINE Engine Cooling - H3

COOLING SYSTEM DRAINING AND FILLING (VAC-N-FILL)

Tools Required

J 26568 Coolant and Battery Tester. See Special Tools.

J 38185 Hose Clamp Pliers. See Special Tools.

GE-47716 Vac-N-Fill Coolant Refill Tool. See Special Tools.

J 42401 Radiator Cap and Surge Tank Test Adapter. See Special Tools.

Draining Procedure

1. Park the vehicle on a level surface.

2. Allow the engine to cool.

3. Remove the radiator cap.

4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

5. Place a drain pan under the lower radiator hose connection at the bottom of the radiator.

6. Using J 38185 slide the hose clamp back on the lower radiator hose. See Special Tools.

7. Slowly remove the lower radiator hose and drain the coolant into the drain pan.

8. Inspect the engine coolant for the following:

Discolored appearance-Follow the flush procedure. Refer to Flushing .

Normal in appearance-Follow the filling procedure.

If a complete block drain is required, remove the coolant heater located on the LH
side of the block. Refer to Coolant Heater Replacement .

Vac-N-Fill Procedure

CAUTION: To avoid being burned, do not remove the radiator cap or

surge tank cap while the engine is hot. The cooling system
will release scalding fluid and steam under pressure if
radiator cap or surge tank cap is removed while the engine
and radiator are still hot.

IMPORTANT: Draining the cooling system with the pressure cap installed will

siphon the coolant from the overflow tank.

IMPORTANT: To prevent boiling of the coolant/water mixture in the vehicles

cooling system, do not apply vacuum to a cooling system above

2007 Hummer H3

2007 ENGINE Engine Cooling - H3

1. Install the J 42401 . See Special Tools.

Fig. 4: Identifying Vac-N-Fill Cap
Courtesy of GENERAL MOTORS CORP.

2. Attach the Van-N-Fill cap to the vehicles coolant fill port.

49°C (120°F). The tool will not operate properly wh en the coolant
is boiling.

2007 Hummer H3

2007 ENGINE Engine Cooling - H3