Hummer H1 (2006+). Manual — part 320
11-14 Heating/Ventilation/Air Conditioning (HVAC)
______________________
Low Side and High Side
Normal But Cooling is
Inadequate
1.
Air and/or moisture in the system.
1.
Leak test the system. Repair leaks if neces-
sary. If leaks are not evident, evacuate and
recharge the system.
2.
Receiver/Dryer fault.
2.
Evacuate the system, replace the receiver/
dryer and recharge the system.
Compressor Diagnosis
Condition
Possible Cause
Correction
Compressor Noise
1.
System overcharge.
1.
Recover all R-134a with J–39500-A ser-
vice cart and recharge with the proper
charge.
2.
Drive belt problem.
2.
Replace the belt if worn, frayed, cut or
torn.
3.
Compressor clutch fault.
3.
Replace the core or pulley bearing as
needed.
4.
Compressor internal fault.
4.
Replace the compressor if pressure test
indicates worn, inoperative condition.
Compressor Does Not
Engage
1.
System fuse blown.
1.
Replace the fuse. Check the circuit for
shorts, ground.
2.
Clutch wires damaged.
2.
Repair the wires.
3.
Pressure cycling clutch or A/C cutout
switch fault.
3.
Replace the switch(s) as needed.
4.
Compressor clutch failure.
4.
Replace the clutch core and/or pulley as
needed.
5.
Compressor seized.
5.
Replace compressor.
6.
High engine coolant temperature trigger-
ing A/C cutout switch.
6.
Let the engine cool down and fix the
engine cooling system problem first.
Compressor Engages but
Cooling is Inadequate
1.
A/C duct restrictions, loose connections.
1.
Repair as needed.
2.
System leaks (high side pressure below
50 psi (345 kPa)).
2.
Check for leaks with J-41995 leak
detection tool and repair as needed.
3.
Expansion valve inoperative.
3.
Replace the valve.
4.
Receiver/Dryer fault.
4.
Replace the receiver/dryer
5.
Condenser fault.
5.
Replace the condenser.
6.
Compressor
internal
wear.
6.
Replace the compressor if pressure
indicates internal wear or damage.
A/C Pressure Test Diagnosis (Continued)
Condition
Possible Cause
Correction
_____________________
Heating/Ventilation/Air Conditioning (HVAC) 11-15
SPECIFICATIONS
System refrigerant — R-134a
Compressor oil — PAG (polyalkaline glycol)
Refrigerant capacity — 2 lbs. 4oz.
Compressor type — Denso
*Low and high side pressures are affected by temperature. Higher temperature will cause higher pressures.
A/C System Test Pressures
Ambient Temperature
Low Side Pressure Range*
High Side Pressure Range*
F°
C°
Psi
kPa
Psi
kPa
70
21
10-32
69-221
112-270
772-1861
75
24
12-33
83-228
120-280
827-1930
80
27
17-34
117-234
131-310
903-2137
85
29
18-35
124-241
185-325
1276-2172
90
32
19-47
131-324
210-330
1448-2275
95
35
21-47
145-324
225-350
1551-2413
100
38
28-51
193-352
240-370
1655-2551
110
43
30-55
207-379
255-390
1758-2689
R-134a Pressure-to-Temperature Relationship Chart (with Engine OFF)
Psi
Temp (°F)
R-134a
Psi
Temp (°F)
R-134a
Psi
Temp (°F)
R-134a
Psi
Temp (°F)
R-134a
0
-14.7
25
29.3
70
69.6
200
130.1
1
-12.1
26
30.5
75
72.9
210
133.5
2
-9.6
27
31.7
80
76.1
220
136.7
3
-7.2
28
32.9
85
79.2
230
139.8
4
-4.9
29
34.0
90
82.2
240
142.9
5
-2.7
30
35.1
95
85.0
250
145.9
6
-0.6
32
37.4
100
87.8
260
148.8
7
1.4
34
39.5
105
90.5
270
151.6
8
3.4
36
41.6
110
93.1
280
154.3
9
5.3
38
43.6
115
95.6
290
157.0
10
7.1
40
45.6
120
98.0
300
159.6
11
8.9
42
47.4
125
100.4
310
162.2
12
10.6
44
49.2
130
102.7
320
164.7
11-16 Heating/Ventilation/Air Conditioning (HVAC)
______________________
Figure 11-4: Vacuum Door Motors
13
12.3
46
51.0
135
104.9
330
167.2
14
13.9
48
52.8
140
107.1
340
169.6
15
15.4
50
54.5
145
109.3
350
171.9
16
17.0
52
56.4
150
111.4
360
174.2
17
18.5
54
57.8
155
113.3
370
176.5
18
19.9
56
59.3
160
115.4
380
178.7
19
21.4
58
60.8
165
117.4
390
180.7
20
22.8
60
62.4
170
119.3
400
183.1
21
24.1
62
63.9
175
121.2
-
-
22
25.5
64
65.4
180
123.0
-
-
23
26.8
66
66.8
185
124.8
-
-
24
28.0
68
68.2
190
126.6
-
-
R-134a Pressure-to-Temperature Relationship Chart (with Engine OFF)
Psi
Temp (°F)
R-134a
Psi
Temp (°F)
R-134a
Psi
Temp (°F)
R-134a
Psi
Temp (°F)
R-134a
FLOOR DOOR MOTOR (RED)
DEFROST BLOCKOFF DOOR MOTOR (BLUE)
RECIRCULATE DOOR MOTOR
(ORANGE)
FACE DOOR MOTOR (YELLOW AND BROWN)
_____________________
Heating/Ventilation/Air Conditioning (HVAC) 11-17
CLIMATE CONTROL HEAD REPLACEMENT
Removal
1.
Remove the radio bezel.
2.
Remove the screw attaching the climate control head to the center dash assembly (Figure 11-5).
3.
Pull the climate control head out far enough to disconnect the electrical connectors and the vacuum hoses.
Installation
1.
Connect the electrical connectors and the vacuum hoses to the climate control head.
2.
Push the climate control head toward the longer side bracket until flush, then secure it with the screws.
3.
Install the radio bezel.
Figure 11-5: Climate Control Head Replacement
Vacuum Door Motor Arm Positioning (Figure 11-4)
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
Recirculate
out
in
out
out
out
out
out
out
CLIMATE CONTROL
RADIO BEZEL
HEAD
AUXILIARY
HEAT-A/C
SWITCH
CENTER DASH
ASSEMBLY
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