Hummer H1 Service Manual page 737

11-18 Heating/Ventilation/Air Conditioning (HVAC)
AIR CONDITIONING PRESSURE HOSE
REPLACEMENT
WARNING: Air conditioning system components are
subject to high-pressure R-134a gas. Always discharge
pressure 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 Assembly
JUNCTION BLOCK
SUCTION HOSE
O-RING
Figure 11-10: Suction/Discharge Hose
Mounting
Suction Manifold Hose Replacement
Removal
1. Discharge the air conditioning system.
2. Remove air cleaner splash shield
3. Disconnect auxiliary hose connection (if equipped).
4. Disconnect the suction hose from the expansion valve
manifold, discard the O-ring (Figure 11-11:).
5. Disconnect the suction hose at the compressor junction
block, discard the O-ring (Figure 11-10).
6. Remove the hose assembly from the vehicle.
DISCHARGE
HOSE
O-RING
00-S11-003
______________________
EXPANSION VALVE
MANIFOLD BLOCK
Figure 11-11: 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 auxiliary unit refrigerant line using new O-ring (if
equipped).
4. Torque auxiliary unit line to 21-27 lb-ft (28-36 N•m).
5. Install suction hose onto compressor junction block fitting
with a new O-ring.
6. Torque the fitting to 21-27 lb-ft (28-36 N•m).
7. Evacuate system for 30 min.
8. Recharge system with 3lbs. 2oz. R134a.
9. Performance test A/C
10. Install air cleaner splash shield.
®
SUCTION HOSE
LIQUID
LINE
AUXILIARY
OUTLETS
00-S11-004