Hummer H3. Manual — part 1105

Fig. 17: Drawing Out Coolant
Courtesy of GENERAL MOTORS CORP.

27. Use the extraction hose to draw out coolant to the proper level.

28. The vacuum tank has a drain valve on the bottom of the tank. Open the valve to drain

coolant from the vacuum tank into a suitable container for disposal.

FLUSHING

Store used coolant in the proper manner, such as in a used engine coolant holding tank. Do not
pour used coolant down a drain. Ethylene glycol antifreeze is a very toxic chemical. Do not
dispose of coolant into the sewer system or ground water. This is illegal and ecologically
unsound.

Various methods and equipment can be used to flush the cooling system. If special equipment is
used, such as a back flusher, follow the manufacturer's instruction. Always remove the thermostat
before flushing the cooling system.

When the cooling system becomes contaminated, the cooling system should be flushed thoroughly
to remove the contaminants before the engine is seriously damaged.

1. Drain the cooling system. Refer to Cooling System Draining and Filling (Static Fill) or

IMPORTANT: Do not use a chemical flush.

2007 Hummer H3

2007 ENGINE Engine Cooling - H3

Cooling System Draining and Filling (Vac-N-Fill).

2. Remove the coolant recovery reservoir. Refer to Coolant Recovery Reservoir

Replacement (Left Hand Drive) or Coolant Recovery Reservoir Replacement (Right
Hand Drive).

3. Clean and flush the coolant recovery reservoir with clean, drinkable water.

4. Install the coolant recovery reservoir. Refer to Coolant Recovery Reservoir Replacement

(Left Hand Drive) or Coolant Recovery Reservoir Replacement (Right Hand Drive).

5. Follow the drain and fill procedure using only clean, drinkable water. Refer to Cooling

System Draining and Filling (Static Fill) or Cooling System Draining and Filling
(Vac-N-Fill).

6. Run the engine for 20 minutes.

7. Stop the engine.

8. Drain the cooling system. Refer to Cooling System Draining and Filling (Static Fill) or

Cooling System Draining and Filling (Vac-N-Fill).

9. Repeat the procedure if necessary, until the fluid is nearly colorless.

10. Fill the cooling system. Refer to Cooling System Draining and Filling (Static Fill) or

Cooling System Draining and Filling (Vac-N-Fill).

RADIATOR CLEANING

Some conditions may require the use of warm water and a mild detergent.

Clean the A/C condenser fins.

Clean between the A/C condenser and radiator.

Clean the radiator cooling fins.

Straighten any damaged cooling fins.

COOLANT RECOVERY RESERVOIR REPLACEMENT (LEFT HAND DRIVE)

CAUTION: NEVER spray water on a hot radiator. The resulting steam

could cause personal injury.

NOTE:

The radiator fins are necessary for good heat transfer. Do not brush
the fins. This may cause damage to the fins, reducing heat transfer.

IMPORTANT: Remove bugs, leaves, dirt and other debris by blowing

compressed air through the engine side of the radiator.

2007 Hummer H3

2007 ENGINE Engine Cooling - H3

Fig. 18: Coolant Recovery Reservoir Replacement (Left Hand Drive)
Courtesy of GENERAL MOTORS CORP.

Coolant Recovery Reservoir Replacement (Left Hand Drive)

Callout

Component Name

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Preliminary Procedure

1. Drain the cooling system. Refer to Cooling System Draining and Filling (Static

Fill) or Cooling System Draining and Filling (Vac-N-Fill).

2. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .

NOTE:

Refer to Fastener Notice .

1

Coolant Reservoir Bolt
Tip: Remove the coolant reservoir hoses from the coolant reservoir.

Tighten: 10 N.m (89 lb in)

2007 Hummer H3

2007 ENGINE Engine Cooling - H3

COOLANT RECOVERY RESERVOIR REPLACEMENT (RIGHT HAND DRIVE)

Fig. 19: Coolant Recovery Reservoir Replacement (Right Hand Drive)
Courtesy of GENERAL MOTORS CORP.

Coolant Recovery Reservoir Replacement (Right Hand Drive)

2

Coolant Reservoir

Callout

Component Name

Preliminary Procedure

1. Drain the cooling system. Refer to Cooling System Draining and Filling (Static

Fill) or Cooling System Draining and Filling (Vac-N-Fill).

2. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .

1

Coolant Reservoir Bolt (Qty: 2)

Tip: Remove the coolant reservoir hoses from the coolant reservoir.

NOTE:

Refer to Fastener Notice .

2007 Hummer H3

2007 ENGINE Engine Cooling - H3