Hummer H2. Manual - part 1394

in Engine Controls - 4.8L, 5.3L and 6.0L. 

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

ENGINE OIL COOLER PIPE/HOSE QUICK CONNECT FITTING 

Removal Procedure 

Fig. 33: Rotating Retaining Ring 

 

2004 Hummer H2 

2004 ENGINE Engine Cooling - Hummer H2

  

Courtesy of GENERAL MOTORS CORP.

1. Disengage the plastic caps from the quick connect fittings. Pull the caps back along the pipe.  

2. Using a bent-tip screwdriver or equivalent, pull on one of the open ends of the retaining ring in order to 

rotate the retaining ring.  

3. Rotate the retaining ring around the quick connector until the retaining ring is out of position and can be 

completely removed. 

Discard the retaining rings. 

 

2004 Hummer H2 

2004 ENGINE Engine Cooling - Hummer H2

  

Fig. 34: Engine Oil Cooler Line 
Courtesy of GENERAL MOTORS CORP. 

4. Remove the engine oil cooler line from the quick connector fitting at the radiator. 

Pull the lines straight out from the connectors. 

5. Clean all of the components in a suitable solvent, and dry them with compressed air.  

6. Inspect the fittings, the connectors, the cooler lines, and the cooler for damage, distortion, or restriction. 

Replace parts as necessary.  

Installation Procedure 

 

2004 Hummer H2 

2004 ENGINE Engine Cooling - Hummer H2

  

Fig. 35: Do Not Install Retaining Ring In This Manner
Courtesy of GENERAL MOTORS CORP. 

1. Install a new retaining ring into each quick connector fitting. 

Fig. 36: Hooking Retaining Ring 
Courtesy of GENERAL MOTORS CORP. 

2. Hook one of the open ends of the retaining ring in one of the slots in the quick connector. 

IMPORTANT: When performing the following procedure, do not reuse the old retaining 

rings. Replace the old retaining rings with new ones. 
Do not install the new retaining ring onto the fitting by pushing the 
retaining ring down over the fitting.

 

2004 Hummer H2 

2004 ENGINE Engine Cooling - Hummer H2