Suzuki 2006 SX4, Service Manual

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Air Conditioning System: Manual Type 7B-10
Low pressure gauge
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.
Pressure is lower than
acceptable range
(“B” area) Insufficient refrigerant (Insufficient charge or
leakage) Check for leakage, repair if necessary
and recharge.
Expansion valve malfunction (valve opens too
wide) Check expansion valve.
Compressor malfunction (Insufficient
compression) Check compressor.
Condition Possible cause Correction
Pressure is higher than
acceptable range
(“C” area) Expansion valve malfunction (valve opens too
wide) Check expansion valve.
Compressor malfunction (Insufficient
compression) Check compressor.
Pressure is lower than
acceptable range
(“D” area) Insufficient refrigerant (Insufficient charge or
leakage) Check for leakage, repair if necessary
and recharge.
Expansion valve malfunction (valve opens too
narrow) Check expansion valve.
Clogged refrigerant passage (crashed pipe) Repair or replace.
[A]: Temp at air outlet of center ventilation louver [C]: Humidity
[B]: Temp near air inlet of HVAC unit [D]: Acceptable range
Condition Possible cause Correction
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
46.4
48.2
50.0
51.8
53.6
55.4
57.2
59.0
60.8
62.6
64.4
66.2
68.0
69.8
71.6
73.4
75.2
77.0
78.8
80.6
82.4
25 30 35
77 86 95
˚F ˚C
˚C
˚F
“E”
“F”
[D]
[B]
30
70
%
[C] [A]
I6RW0C721005-02