Hummer H1 (2002+). Manual — part 184
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Heating/Ventilation/Air Conditioning (HVAC) 11-15
®
05745159
Figure 11-5: Vacuum Door Motors
Vacuum Door Motor Arm Positioning
OFF
MAX
A/C
A/C Blend
Face
Floor
Defrost/
Floor
Defrost
Floor out
out out
in
out
in
out
out
Defrost
blockoff
out
out out
out
out
out out
in
Face
out
in in
half
in
out
out
out
Defrost
out
out
out
out
out
out
out
in
Recirculate
out
in
out
out
out
out
out
out
7-S11-031
FLOOR DOOR MOTOR (RED)
FACE DOOR MOTOR(YELLOW AND BROWN)
DEFROST BLOCKOFF DOOR MOTOR(BLUE)
DEFROST DOOR MOTOR (SILVER)
RECIRCULATE DOOR MOTOR
(ORANGE)
11-16
Heating/Ventilation/Air Conditioning (HVAC)
______________________
®
CLIMATE CONTROL HEAD REPLACEMENT
Removal
1.
Remove front console.
2.
Remove screw attaching climate control head to support
plate side bracket (Figure 11-6).
3.
Pull climate control head from behind support plate so that
it angles away from longer side bracket.
4.
Pull climate control head from shorter side bracket.
Installation
1.
From behind support plate, angle climate control panel
behind shorter of two side brackets.
2.
Push climate control head toward longer side bracket until
flush, then secure it with a screw.
3.
Slide rear bracket onto back lip of climate control head.
4.
Install front console.
Figure 11-6: Climate Control Head Replacement
CONSOLE
CLIMATE CONTROL
SUPPORT PLATE
FACE PLATE
HEAD
AUXILIARY
HEAT-A/C
SWITCH
_____________________
Heating/Ventilation/Air Conditioning (HVAC) 11-17
®
05745159
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 refrig-
erant leaks. When service requires disconnecting and connect-
ing fittings, observe the following:
• When tightening or loosening hose and tube fittings, use
two wrenches for equalized support (Figure 11-7).
Figure 11-7: Hose and Tube Fittings
• Plug open ends of hoses after disassembly. Do not re-
move 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 as-
sembly (Figure 11-8).
• Carefully interlock male and female ends of hoses
(Figure 11-9).
• 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 11-8: Correct Seating O-Rings
Figure 11-9: Proper Connection of Hose End
Pressure Hose Torque Values
Hose Size
Torque
(Ft. Lb.)
Torque
(Newton Meters)
Minimum Maximum Minimum Maximum
#6 Liquid
Hose
11
13
15
17
#8 Discharge
Hose
15
20
20
27
#10 Suction
Hose
21
27
28
36
#12 Suction
Hose
24
28
33
38
INCORRECT
INCORRECT
PROPERLY
SEATED
FEMALE
MALE
CORRECT
INCORRECT
END
END
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
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.
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.
00-S11-003
SUCTION HOSE
JUNCTION BLOCK
DISCHARGE
HOSE
O-RING
O-RING
00-S11-004
LIQUID
SUCTION HOSE
EXPANSION VALVE
MANIFOLD BLOCK
AUXILIARY
OUTLETS
LINE
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