Suzuki GRAND VITARA Owner's Manual page 1133

Manifold Gauge (kg/cm
Lo
M16 engine model M16 engine model
0.23 – 0.33 0.96 – 1.16
(2.3 – 3.3) (9.6 – 11.6)
(33 – 47) (136 – 165)
J20 engine model J20 engine model
0.22 – 0.31 1.10 – 1.45
(2.2 – 3.1) (11.0 – 14.5)
(31 – 44) (156 – 206)
0.5 – 0.6
Negative pressure
(71.2 – 85.3)
Normal:
Normal: M16 engine model
M16 engine model 0.96 – 1.16
0.23 – 0.33 (9.6 – 11.6)
(2.3 – 3.3) (136 – 165)
(33 – 47) J20 engine model
J20 engine model 1.10 – 1.45
0.22 – 0.31 (11.0 – 14.5)
(2.2 – 3.1) (156 – 206)
(31 – 44)
↑ ↓
Abnormal:
Abnormal: 0.7 – 1.0
Negative pressure
(100 – 142)
0.05 – 0.15
(0.5 – 1.5)
(4.2 – 21.3)
0.7 – 1.0
(100 – 142)
0.4 – 0.6
(4 – 6)
(56.9 – 85.3)
Condition
MPa
2 )
Detail
(psi)
Hi
Normal condition
The low pressure side
reads a negative pressure,
and the high pressure side
reads an extremely low
(5 – 6)
pressure.
Presence of frost around
tubing to and from receiver/
dryer and expansion valve.
During A/C operation, the
low pressure side
sometimes indicates
negative pressure, and
sometimes normal
pressure. Also high
pressure side reading
↑ ↓
fluctuates between the
abnormal and normal
pressure.
(7 – 10)
Both low and high pressure
sides indicate low readings.
Output air is slightly cold.
(7 – 10)
Pressure on low pressure
side is high.
Pressure on high pressure
side is low.
Both pressure becoming
equal right after A/C is
turned OFF.
Air Conditioning System:
Possible Cause
—
Dust particles or water
droplets are either stuck
or frozen inside
expansion valve,
preventing the
refrigerant from flowing.
Expansion valve is
frozen due to moisture
in the system, and
temporarily shuts off the
refrigeration cycle.
Insufficient refrigerant in
system. (Refrigerant
leaking)
Internal leak in
compressor
7B-24
Correction
—
Clean expansion valve.
Replace it if it cannot be
cleaned.
Replace desiccant.
Evacuate the A/C
system and recharge
with fresh refrigerant.
Replace expansion
valve.
Replace desiccant.
Evacuate A/C system
and recharge with fresh
refrigerant.
Using a gas leak
detector, check for leaks
and repair as necessary.
Recharge refrigerant to a
specified amount.
If the pressure reading is
almost 0 when the
manifold gauges are
attached, check for any
leaks, repair them, and
evacuate the system.
Inspect compressor and
repair or replace as
necessary.