Suzuki Grand Vitara JB416 / JB420 / JB419. Service manual - part 385
7B-31 Air Conditioning System:
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.
M16 engine model
0.35 – 0.45
(3.5 – 4.5)
(50 – 64)
J20 engine model
0.33 – 0.45
(3.3 – 4.5)
(47 – 64)
F9Q engine model
0.35 – 0.45
(3.5 – 4.5)
(50 – 64)
2.0 – 2.5
(20 – 25)
(285 – 355)
High pressure reading on
both low and high pressure
sides.
Overcharged A/C
system.
Faulty condenser
cooling operation.
Faulty radiator fan
operation.
Adjust refrigerant to
specified amount.
Clean condenser.
Inspect and repair
radiator fan.
High pressure reading on
both low and high pressure
sides.
Low pressure side tubing is
not cold when touched.
Presence of air in A/C
system. (Improperly
evacuated)
Replace desiccant.
Inspect quantity of
compressor oil and
presence of
contaminants in oil.
Evacuate system and
recharge with fresh
refrigerant.
0.45 – 0.55
(4.5 – 5.5)
(64 – 78)
High pressure reading on
both low and high pressure
sides.
Large amount of frost or
dew on the low pressure
side tubing.
Faulty expansion valve.
Refrigerant flow is not
regulated properly.
Replace expansion
valve.
Condition
Possible Cause
Correction
Manifold Gauge
MPa
(kg/cm
2
)
(psi)
Detail
Lo
Hi