Hummer H2. Manual - part 1387

RADIATOR CLEANING 

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

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Clean the A/C condenser fins.  

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Clean between the A/C condenser and radiator.  

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Clean the radiator cooling fins.  

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Straighten any damaged cooling fins.  

SURGE TANK REPLACEMENT 

Removal Procedure 

1. Block the drive wheels.  

2. Place the transmission in park (P) or neutral (N).  

3. Engage the park brake.  

4. Run the engine until the thermostat opens.  

5. Stop the engine.  

6. Follow the drain and fill procedure using only clean drinkable water. 

Repeat the procedure if necessary, until the fluid is nearly colorless. Refer 
to Draining and Filling Cooling System .  

7. Fill the coolant reservoir to the FULL HOT mark.  

8. Fill the cooling system. Refer to Draining and Filling Cooling System .  

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.

 

2004 Hummer H2 

2004 ENGINE Engine Cooling - Hummer H2

  

Fig. 7: Surge Tank Components 
Courtesy of GENERAL MOTORS CORP. 

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

2. Reposition the surge tank inlet hose clamp (1) from the surge tank (2).  

3. Remove the surge tank inlet hose (6) from the surge tank (2).  

4. Reposition the surge tank outlet hose clamp (5) from the surge tank (2).  

5. Remove the surge tank outlet hose (3) from the surge tank (2). 

 

2004 Hummer H2 

2004 ENGINE Engine Cooling - Hummer H2

  

Fig. 8: Identifying Surge Tank 
Courtesy of GENERAL MOTORS CORP. 

6. Remove the bolt (1) from the surge tank (4).  

7. Remove the nut (3) from the surge tank (4).  

8. If equipped disconnect the electrical connector from the low coolant level switch.  

 

2004 Hummer H2 

2004 ENGINE Engine Cooling - Hummer H2

  

9. Remove the surge tank (4) from the vehicle (5).  

Installation Procedure 

Fig. 9: Identifying Surge Tank 
Courtesy of GENERAL MOTORS CORP.

 

2004 Hummer H2 

2004 ENGINE Engine Cooling - Hummer H2