Suzuki Grand Vitara JB627. Manual - part 277
7B-24 Air Conditioning System:
Condition
Possible Cause
Correction
Manifold Gauge
MPa
(kg/cm
2
)
(psi)
Detail
Lo
Hi
0.28 – 0.39
(2.8 – 3.9)
(40 – 55)
1.34 – 1.67
(13.4 – 16.7)
(191 – 237)
Normal condition
—
—
Negative pressure
0.5 – 0.6
(5 – 6)
(71.2 – 85.3)
The low pressure side
reads a negative pressure,
and the high pressure side
reads an extremely low
pressure.
Presence of frost around
tubing to and from receiver/
dryer and expansion valve.
Dust particles or water
droplets are either stuck
or frozen inside
expansion valve,
preventing the
refrigerant from flowing.
Clean expansion valve.
Replace it if it cannot be
cleaned.
Replace desiccant and
cap with filter.
Evacuate the A/C
system and recharge
with fresh refrigerant.
Normal:
0.28 – 0.39
(2.8 – 3.9)
(40 – 55)
↑ ↓
Abnormal:
Negative pressure
Normal:
1.34 – 1.67
(13.4 – 16.7)
(191 – 237)
↑ ↓
Abnormal:
0.7 – 1.0
(7 – 10)
(100 – 142)
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.
Expansion valve is
frozen due to moisture
in the system, and
temporarily shuts off the
refrigeration cycle.
Replace expansion
valve.
Replace desiccant and
cap with filter.
Evacuate A/C system
and recharge with fresh
refrigerant.
0.05 – 0.15
(0.5 – 1.5)
(4.2 – 21.3)
0.7 – 1.0
(7 – 10)
(100 – 142)
Both low and high pressure
sides indicate low readings.
Output air is slightly cold.
Insufficient refrigerant in
system. (Refrigerant
leaking)
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.
0.4 – 0.6
(4 – 6)
(56.9 – 85.3)
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.
Internal leak in
compressor
Inspect compressor and
repair or replace as
necessary.