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Suzuki SX4 Service Manual page 1004

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7B-10 Air Conditioning System: Manual Type
Condition
Pressure is lower than
acceptable range
("B" area)
Low pressure gauge
Condition
Pressure is higher than
acceptable range
("C" area)
Pressure is lower than
acceptable range
("D" area)
11) Check inlet port temperature-to-outlet port temperature relationship using the graph. For example, if temperature
near air inlet of HVAC unit is 30 °C (86 °F) and the one at air outlet of center ventilation louver is 17 °C (62.6 °F),
their crossing point is within acceptable range as shown in the graph. In this case, cooling performance is
satisfactory and proper.
12) If crossing point is out of acceptable range, diagnose trouble referring to the following table.
[A]: Temp at air outlet of center ventilation louver
[B]: Temp near air inlet of HVAC unit
Possible cause
Insufficient refrigerant (Insufficient charge or
leakage)
Expansion valve malfunction (valve opens too
wide)
Compressor malfunction (Insufficient
compression)
Possible cause
Expansion valve malfunction (valve opens too
wide)
Compressor malfunction (Insufficient
compression)
Insufficient refrigerant (Insufficient charge or
leakage)
Expansion valve malfunction (valve opens too
narrow)
Clogged refrigerant passage (crashed pipe)
F
C
82.4
28
80.6
27
78.8
26
77.0
25
75.2
24
73.4
23
71.6
22
[A]
69.8
21
68.0
20
66.2
19
64.4
18
62.6
17
60.8
16
59.0
15
57.2
14
55.4
13
53.6
12
51.8
11
50.0
10
48.2
9
46.4
8
25
77
Check for leakage, repair if necessary
and recharge.
Check expansion valve.
Check compressor.
Check expansion valve.
Check compressor.
Check for leakage, repair if necessary
and recharge.
Check expansion valve.
Repair or replace.
%
70
"E"
[C]
30
"F"
30
35
C
86
95
F
[B]
I6RW0D721002-01
[C]: Humidity
[D]: Acceptable range
Correction
Correction

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