Hummer H2. Manual - part 2630

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1-2 shift control solenoid.  

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2-3 shift control solenoid.  

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Pressure control solenoid.  

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TCC PWM solenoid.  

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3-2 shift control solenoid.  

9. Install the 1-2 accumulator. See ACCUMULATOR ASSEMBLY .  

10. Connect the transmission harness 20-way connector to the transmission pass through connector. Align the 

arrows on each half of the connector and insert straight down. See Fig. 47 .  

11. Install the transmission oil pan and filter. See DRAINING & REFILLING under LUBRICATION.  

TRANSMISSION COOLER LINES 

Removal 

1. Remove the air cleaner resonator outlet duct. Remove the transmission fluid cooler hose from the 

auxiliary transmission oil cooler. See TRANSMISSION COOLER LINE QUICK CONNECT 
FITTING .  

2. Remove the bolts from the auxiliary oil cooler. Remove the auxiliary oil cooler from the vehicle. Remove 

the transmission fluid cooler hose from the auxiliary transmission fluid cooler. See TRANSMISSION 
COOLER LINE QUICK CONNECT FITTING .  

3. Remove the transmission fluid cooler hoses from the radiator. See TRANSMISSION COOLER LINE 

QUICK CONNECT FITTING . Raise and support the vehicle.  

4. Remove the bolts from the transmission fluid cooler hose insulator. Remove the transmission fluid cooler 

hose insulator from the transmission. Remove the cooling lines from the clips.  

5. Remove the cooling lines from the transmission. See TRANSMISSION COOLER LINE QUICK 

CONNECT FITTING .  

Installation 

1. Install the cooling lines to the transmission. See TRANSMISSION COOLER LINE QUICK 

CONNECT FITTING .  

2. Install the cooling lines to the clips. Install the transmission fluid cooler hose insulator to the 

transmission. Install the bolts to the transmission fluid cooler hose insulator. Tighten the bolts to 
specification. See TORQUE SPECIFICATIONS .  

3. Lower the vehicle. Install the transmission fluid cooler hose to the radiator. See TRANSMISSION 

COOLER LINE QUICK CONNECT FITTING .  

4. Install the auxiliary oil cooler to the vehicle. Install the bolts to the transmission fluid auxiliary cooler. 

Tighten the bolts to specification. See TORQUE SPECIFICATIONS .  

5. Install the transmission fluid cooler hose to the Auxiliary transmission oil cooler. See TRANSMISSION 

COOLER LINE QUICK CONNECT FITTING .  

6. Install the air cleaner resonator outlet duct.  

TRANSMISSION COOLER LINE QUICK CONNECT FITTING

 

2004 Hummer H2 

2003-04 AUTOMATIC TRANSMISSIONS Servicing - H2

  

Removal 

1. Pull the plastic cap back from the quick connect fitting and down along the cooler line about 2 in (5 cm).  

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

retaining ring around the quick connect fitting until the retaining ring is out of position and can be 
completely removed. See Fig. 52 .  

3. Remove the retaining ring from the quick connect fitting.  

4. Discard the retaining ring.  

5. Pull the cooler line straight out from the quick connect fitting. See Fig. 53 .  

Fig. 52: Removing Retaining Ring 
Courtesy of GENERAL MOTORS CORP.

 

2004 Hummer H2 

2003-04 AUTOMATIC TRANSMISSIONS Servicing - H2

  

Fig. 53: Removing & Installing Cooler Line From Quick Connect Fitting 
Courtesy of GENERAL MOTORS CORP. 

Installation 

1. Install a new retaining ring into the quick connect fitting using the following procedure: 

A. Hook one of the open ends of the retaining ring in one of the slots in the quick connect fitting. See 

Fig. 54 .  

B. Rotate the retaining ring around the fitting until the retaining ring is positioned with all three ears 

through the three slots on the fitting. See Fig. 55 .  

C. DO NOT install the new retaining ring onto the fitting by pushing the retaining ring. See Fig. 56 .  

D. Ensure that the three retaining ring ears are seen from inside the fitting and that the retaining ring 

moves freely in the fitting slots. See Fig. 57 . 

NOTE:

DO NOT reuse any of the existing transmission lines or transmission line 
fittings if there is excessive corrosion. DO NOT reuse any of the existing 
retaining rings that were removed from the existing quick connect fittings. 
Install new retaining rings. 

 

2004 Hummer H2 

2003-04 AUTOMATIC TRANSMISSIONS Servicing - H2

  

2. Install the cooler line into the quick connect fitting. See Fig. 58 .  

3. Insert the cooler line end into the quick connect fitting until a click is either heard or felt.  

4. DO NOT use the plastic cap on the cooler line in order to install the cooler line into the fitting. See Fig. 

59 .  

5. Pull back sharply on the cooler line in order to ensure that the cooler line is fastened into the quick 

connect fitting.  

6. Position (snap) the plastic cap onto the fitting. DO NOT manually depress the retaining ring when 

installing the plastic cap onto the quick connect fitting. See Fig. 60 .  

7. Ensure that the plastic cap is fully seated against the fitting.  

8. Ensure that no gap is present between the cap and the fitting. See Fig. 61 .  

9. Ensure that the yellow identification band on the tube is hidden within the quick connect fitting. See Fig. 

60 .  

10. A hidden yellow identification band indicates proper joint seating. See Fig. 62 .  

11. Fill transmission to proper level with appropriate fluid. See LUBRICATION .  

Fig. 54: Starting Retaining Ring Onto Quick Connect Fitting 
Courtesy of GENERAL MOTORS CORP.

 

2004 Hummer H2 

2003-04 AUTOMATIC TRANSMISSIONS Servicing - H2