Hummer H2. Manual - part 2224

9. Pressurize the air springs. Refer to Air Suspension Pressurization Procedure .  

10. Lower the vehicle.  

11. Start the vehicle and run for approximately 2 minutes to ensure that the air spring leveling system is 

functioning properly.  

12. Verify the D height. Refer to Trim Height Specifications in Suspension General Diagnosis.  

13. Check for leaks. If a leak is found at the air supply line connections replace the air supply lines. Refer to 

Air Suspension Air Line Replacement .  

COMPRESSOR AUTOMATIC LEVEL CONTROL REPLACEMENT 

Removal Procedure 

1. Remove the compressor assembly from the vehicle and place on a bench. Refer to Compressor 

Assembly Automatic Level Control Air Replacement . 

CAUTION: Do NOT remove an air supply pipe in an attempt to depressurize the air 

suspension. Always follow the Air Suspension Depressurization 
Procedure in Air Suspension. Failure to follow this procedure may cause 
personal injury or damage to the vehicle.

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2

  

Fig. 32: View Of Compressor 
Courtesy of GENERAL MOTORS CORP. 

2. Disconnect all electrical connections (2, 3).  

3. Remove connector (3) from the mounting bracket.  

4. Remove the mounting nuts (1).  

5. Remove the compressor.  

Installation Procedure 

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2

  

Fig. 33: View Of Compressor 
Courtesy of GENERAL MOTORS CORP. 

1. Install the compressor. 

2. Install the mounting nuts (1). 

Tighten: Tighten the nuts to 25 N.m (18 lb ft). 

3. Install connector (3) to the mounting bracket. 

NOTE:

Refer to Fastener Notice in Cautions and Notices.

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2

  

4. Connect all electrical connections (2, 3).  

5. Install the compressor assembly to the vehicle. Refer to Compressor Assembly Automatic Level 

Control Air Replacement .  

INFLATOR AIR SWITCH REPLACEMENT 

Removal Procedure 

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.  

2. Disconnect the air inflator switch harness and the air line from the air compressor.  

3. Lower the vehicle. 

 

2004 Hummer H2 

2004 SUSPENSION Air Suspension - Hummer H2