Hummer H1 Service Manual page 747

11-28 Heating/Ventilation/Air Conditioning (HVAC)
COMPRESSOR REPLACEMENT
WARNING: Air conditioning system components are
subject to high-pressure refrigerant R-134a gas. Always
discharge pressure and contain R-134a 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. Fail-
ure to follow these warnings may result in serious in-
jury.
Removal
1. Discharge air conditioning system.
2. Disconnect electrical
(Figure 11-25).
SEALING WASHERS
ELECTRICAL
CONNECTOR
COMPRESSOR
Figure 11-25: Air Conditioner Compressor and
Mounting Hardware
3. Remove serpentine belt from pulley.
4. Remove suction/discharge hose assembly and sealing
washers from top of compressor. Discard sealing washers.
5. Remove four bolts and compressor from compressor
support bracket.
6. Drain the oil from the compressor and measure the
amount.
connector from compressor
SUCTION/DISCHARGE
HOSE ASSEMBLY
COMPRESSOR
SUPPORT BRACKET
______________________
Installation
NOTE: Sealing washers, by design, do not require lubrication.
Lubricating sealing washers during replacement will increase
the possibility of contamination, which may result in refriger-
ant leaks.
1. Drain 8 oz. of oil from the new compressor. Replace the
amount that was drained from the previously removed
compressor +1 oz.
2. Secure compressor to compressor support bracket with
four bolts (Figure 11-25).
3. Insert two sealing washers and secure suction/discharge
hose assembly to top of compressor with washer and bolt.
Tighten bolt to 28 lb-ft (38 N•m).
4. Connect electrical connector to spade terminals on
compressor.
5. Evacuate and charge air conditioning system.
6. Perform air conditioning system service, evacuate, charge,
and test for leaks.
Compressor Clutch Plate and
Hub Replacement
Removal
NOTE: Removal and installation of external compressor parts,
and disassembly and assembly of internal parts, must be per-
formed on a clean workbench. The work area, tools, and parts
must be kept clean at all times.
1. Remove compressor.
2. Clamp the holding fixture in a vise and attach compressor
to holding fixture from set J–34021-A with thumb-screws
(Figure 11-26).
CLUTCH PLATE
AND HUB ASSEMBLY
CLUTCH HUB
HOLDING TOOL
HOLDING FIXTURE
COMPRESSOR
Figure 11-26: Compressor
®
NUT SOCKET
THUMB-SCREW