Suzuki GRAND VITARA Owner's Manual page 1132

7B-23 Air Conditioning System:
11) Check inlet port temperature-to-outlet port temperature relationship using graph.
For example, if A/C evaporator inlet port temperature is 25 °C (77 °F) and center ventilation louver temperature is
13 °C (55.4 °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
Thermometer at center duct
Condition
Crossing point is higher
than acceptable range
("E" area)
Crossing point is lower
than acceptable range
("F" area)
NOTE
If ambient temperature is within 25 °C (77 °F), it is possible to diagnose A/C system in detail referring
to the following table.
%
70
"E"
30
"F"
C
30 35
F
86 95
Temp. near Air Inlet of HVAC unit
[A]: M16 engine model
[B]: J20 engine model
Possible Cause
Insufficient or excessive charge of refrigerant Check refrigerant pressure.
Dirty or bent A/C evaporator fins
Air leakage from cooling (heater) unit or air
duct
Malfunctioning, switch over function of
damper in cooling (heater) unit
Compressor malfunction
Insufficient air volume from center duct
(Heater blower malfunction)
Compressor malfunction
[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
57.2 14
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
Clean or repair.
Repair or replace.
Repair or replace.
Check compressor.
Check blower motor and fan.
Check compressor.
%
70
30
"F"
35 C
95 F
I5JB0A720013-03
Correction