Suzuki Grand Vitara 1998, Service Manual

Page: 86 / 801

YH4
GRAND
VITARA
AIR CONDITIONING (OPTIONAL) 1B-15
AMBIENT TEMPERATURE WITHIN 30 – 35
_
C (85 – 95
_
F)
CONDITION
MANIFOLD
GAUGE
MPa
(kg / cm
2
)
(psi)
DETAIL
CAUSE CORRECTION
Lo Hi
0.23 – 0.35
(2.3 – 3.5)
(33 – 50)
1.4 – 1.75
(14 – 17.5)
(200 – 249)
Normal condition. —— ——
Negative
pressure
0.5 – 0.6
(5 – 6)
(71.2 – 85.3)
D
The low pressure side
reads a negative pressure,
and the high pressure side
reads an extremely low
pressure.
D
Presence of frost around
tubing to and from receiver /
dryer and expansion valve.
D
Dust particles or water
droplets are either stuck or
frozen inside expansion
valve, preventing the
refrigerant from flowing.
D
Clean expansion valve.
Replace it if it cannot be
cleaned.
D
Replace receiver / dryer.
D
Evacuate the A / C
system and recharge
with fresh refrigerant.
Normal:
0.23 – 0.35
(2.3 – 3.5)
(33 – 50)
Abnormal:
Negative
pressure
Normal:
1.4 – 1.75
(14 – 17.5)
(200 – 249)
Abnormal:
0.69 – 0.98
(7 – 10)
(100 – 142)
D
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.
D
Expansion valve is frozen
due to moisture in the
system, and temporarily
shuts off the refrigeration
cycle.
D
Replace expansion
valve.
D
Replace receiver / dryer.
D
Evacuate A / C system
and recharge with fresh
refrigerant.
0.05 – 0.15
(0.5 – 1.5)
(4.2 – 21.3)
0.69 – 0.98
(7 – 10)
(100 – 142)
D
Both low and high pressure
sides indicate low readings.
D
Continuous air bubbles are
visible through sight glass.
D
Output air is slightly cold.
D
Insufficient refrigerant in
system. (Refrigerant
leaking)
D
Using a gas leak
detector, check for leaks
and repair as necessary.
D
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)
D
Pressure on low pressure
side is high.
D
Pressure on high pressure
side is low.
D
Both pressure becoming
equal right after A / C is
turned OFF.
D
Internal leak in compressor.
D
Inspect compressor and
repair or replace as
necessary.
0 35 0 45
D
High pressure reading on
both low and high pressure
sides.
D
Air bubbles are not visible
even when engine rpm is
lowered.
D
Overcharged A / C system.
D
Faulty condenser cooling
operation.
D
Faulty condenser fan
operation.
D
Adjust refrigerant to
specified amount.
D
Clean condenser.
D
Inspect and repair
condenser fan.
0.35 – 0.45
(3.5 – 4.5)
(50 – 64)
1.96 – 2.45
(20 – 25)
(285 – 355)
D
High pressure reading on
both low and high pressure
sides.
D
Low pressure side tubing is
not cold when touched.
D
Air bubbles are visible
through sight glass.
D
Presence of air in A / C
system. (Improperly
evacuated)
D
Replace receiver / dryer.
D
Inspect quantity of
compressor oil and
presence of
contaminants in oil.
D
Evacuate system and
recharge with fresh
refrigerant.
0.45 – 0.55
(4.5 – 5.5)
(64 – 78)
D
High pressure reading on
both low and high pressure
sides.
D
Large amount of frost or
dew on the low pressure
side tubing.
D
Faulty expansion valve.
D
Refrigerant flow is not
regulated properly.
D
Replace expansion
valve.