Hummer H1 (2006+). Manual — part 321
11-18 Heating/Ventilation/Air Conditioning (HVAC)
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PRESSURE HOSE TORQUE SPECIFICATIONS
CAUTION: To avoid potential thread or fitting damage, hand start connections before using wrenches.
Air conditioning system fittings are a common source of refrigerant leaks. When service requires disconnecting and connecting fit-
tings, observe the following:
• When tightening or loosening hose and tube fittings, use two wrenches for equalized support (Figure 11-6).
Figure 11-6: Hose and Tube Fittings
• Plug the open ends of hoses after disassembly. Do not remove the plugs from hose fittings until each component is ready for
connection. This will prevent moisture and dirt contamination which can cause compressor wear and system blockage.
• Make sure that O-rings are properly seated before assembly (Figure 11-7).
• Carefully interlock male and female ends of hoses (Figure 11-8).
• Before making any hose and tube connection, apply a few drops of refrigerant oil to the O-rings and threaded portions of the
connector. Make connections quickly.
• Tighten fittings to proper torque specification based on hose size.
Figure 11-7: Correct Seating O-Rings
INCORRECT
INCORRECT
PROPERLY
SEATED
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Heating/Ventilation/Air Conditioning (HVAC) 11-19
Figure 11-8: Proper Connection of Hose End
AIR CONDITIONING PRESSURE HOSE REPLACEMENT
WARNING: Air conditioning system components are subject to high-pressure R-134a gas. Always discharge pres-
sure and contain refrigerant using approved service equipment. Use extreme care when handling R-134a. Direct
contact with skin may cause frostbite. Do not smoke in areas where R-134a is stored or used. Failure to follow these
warnings may result in serious injury.
CAUTION: Cover all open lines to prevent contamination.
Suction Manifold Hose Replacement
Removal
1.
Discharge the air conditioning system.
2.
Remove the air cleaner and the splash shield.
3.
Disconnect the auxiliary hose connection.
4.
Disconnect the suction hose from the expansion valve manifold, discard the O-ring (Figure 11-9).
5.
Disconnect the suction hose at the compressor discard the O-ring (Figure 11-10).
6.
Remove the hose assembly from the vehicle.
Pressure Hose Torque Values
Hose Size
Torque
(Ft. Lb.)
Torque
(Newton Meters)
Minimum
Maximum
Minimum
Maximum
#6 Liquid
Hose
11
13
15
17
#8 Dis-
charge
Hose
15
20
20
27
#10 Suction
Hose
21
27
28
36
#12 Suction
Hose
24
28
33
38
FEMALE MALE
CORRECT
INCORRECT
END
END
11-20 Heating/Ventilation/Air Conditioning (HVAC)
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Figure 11-9: Suction Manifold Hose Removal
Installation
1.
Install the suction hose onto the expansion valve manifold block with a new O-ring.
2.
Torque the fitting to 21-27 lb-ft. (28-36 N•m).
3.
Install the auxiliary unit refrigerant line using a new O-ring.
4.
Torque the auxiliary unit line to 21-27 lb-ft. (28-36 N•m).
5.
Install the suction hose onto the compressor with a new O-ring and torque the bolt to 12 lb-ft. (16 N·m).
6.
Evacuate the system for 30 min.
7.
Recharge the system with 2lbs. 4oz. R134a.
8.
Performance test the A/C system.
9.
Install the air cleaner and the splash shield.
Discharge Hose Replacement
Removal
1.
Disconnect the discharge hose from the condenser. Remove and discard the O-ring (Figure 11-11).
LIQUID
SUCTION HOSE
EXPANSION VALVE
MANIFOLD BLOCK
AUXILIARY
OUTLETS
LINE
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Heating/Ventilation/Air Conditioning (HVAC) 11-21
Figure 11-10: A/C System
2.
Remove the P-clamp holding the line to the support bracket.
3.
Remove the discharge hose from the compressor and discard the O-ring (Figure 11-9).
Installation
CAUTION: To avoid potential thread or fitting damage, hand start connections before using wrenches.
1.
Position the O-ring on the discharge hose (Figure 11-9).
2.
Secure the discharge hose to the compressor with the bolt and torque to 12 lb-ft. (16 N·m).
3.
Lubricate the O-ring and install the discharge hose to the condenser and torque the nut to 12 lb-ft. (16 N·m).
4.
Install the driver side engine splash shield.
5.
Evacuate and charge the air conditioning system.
6.
Check for system leaks.
7.
Check the A/C operation.
Condenser-to-Receiver/Dryer Hose
WARNING: Air conditioning system components are subject to high pressure R-134a gas. Always discharge pres-
sure and contain refrigerant using approved service equipment. Use extreme care when handling R-134a. Direct
contact with skin may cause frostbite. Do not smoke in areas where R-134a is stored or used. Failure to follow these
warnings may result in serious injury.
CONDENSER
DISCHARGE HOSE
O-RING
P-CLAMP
RECEIVER
DRYER
EXPANSION VALVE
MANIFOLD BLOCK
OUTLETS
TO AUXILIARY
COMPRESSOR
SUCTION HOSE
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