Suzuki Grand Vitara 2011 Manual page 1553

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 graph.
For example, if A/C evaporator inlet port temperature is 30 °C (86 °F) and center ventilation louver temperature is
15 °C (59 °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]
F C
82.4 28
80.6 27
78.8 26
77.0 25
75.2 24
73.4 23
71.6 22
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
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)
%
70
"E"
30
"F"
30 35 C
86 95 F
Temp. near Air Inlet of HVAC unit
Air Conditioning System:
Check expansion valve.
Check compressor.
Check for leakage, repair if necessary and
recharge.
Check expansion valve.
Repair or replace.
[B]
F C
82.4 28
80.6 27
78.8 26
77.0 25
"E"
75.2 24
73.4 23
71.6 22
69.8 21
68.0 20
66.2 19
64.4 18
62.6 17
60.8 16
59.0 15
14
57.2
55.4 13
53.6 12
51.8 11
50.0 10
48.2 9
46.4 8
25 30
77 86
Temp. near Air Inlet of HVAC unit
7B-28
Correction
%
70
30
"F"
C
35
F
95
I5JB0A720013-03