MARUTI SUZUKI Maruti 800 Service Manual page 61

1B-10 AIR CONDITIONING (OPTIONAL)
DETAIL DIAGNOSIS TABLE AT AMBIENT TEMPERATURE WITHIN 30 – 35 5C (85 – 95 5F)
MPa
MANIFOLD kg/cm
GAUGE psi
Lo Hi
0.2 – 0.3 1.18 – 1.47
2.0 – 3.0 12.0 – 15.0
28.4 – 42.6 170 – 213
0.5 – 0.6
Negative
5 – 6
pressure
71.2 – 85.3
Normal: Normal:
0.2 – 0.3 1.18 – 1.47
2.0 – 3.0 12.0 – 15.0
28.4 – 42.6 170 – 213
µ µ
Abnormal: Abnormal:
Negative 0.69 – 0.98
pressure 7 – 10
99.4 – 142
0.05 – 0.1
0.5 – 1.0
7.1 – 14.2
0.69 – 0.98
7 – 10
100 – 142
0.4 – 0.6
4 – 6
56.9 – 85.3
0.25 – 0.3 1.96 – 2.45
2.5 – 3.0 2 5 3 0 20 – 25 20
35.6 – 42.6 285 – 355
0.3 – 0.4 1.86 – 1.96
3.0 – 4.0 19 – 20
42.7 – 56.8 271 – 284
2
CONDITION
Normal condition.
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 During A/C operation, the
low pressure side some-
times indicates negative
pressure, and sometimes
normal pressure. Also
high pressure side reading
fluctuates between the ab-
normal and normal pres-
sure.
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 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 High pressure reading on
both low and high
pressure sides.
D Air bubbles are not visible
even when engine rpm is
lowered.
25
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 High pressure reading on
both low and high
pressure sides.
D Large amount of frost or
dew on the low pressure
side tubing.
CAUSE
D Dust particles or water
droplets are either stuck or
frozen inside expansion
valve, preventing the re-
frigerant from flowing.
D Gas leak from heat-sensi-
tizing tube is preventing
refrigerant flow.
D Expansion valve is frozen
due to moisture in the sys-
tem, and temporarily shuts
off the
refrigeration cycle.
D Insufficient refrigerant in
system.
(Refrigerant leaking)
D Internal leak in compres-
sor.
D Overcharged A/C system.
D Faulty condenser
cooling operation.
D Faulty condenser fan op-
eration.
D Presence of air in A/C sys-
tem.
(Improperly evacuated)
D Faulty expansion valve or
improper attachment of
heat-sensitizing tube.
D Refrigerant flow is not regu-
lated properly.
CORRECTION
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 re-
frigerant.
D If heat-sensitizing tube is
defective, replace expan-
sion valve.
D Replace expansion valve.
D Replace receiver/dryer.
D Evacuate A/C system and
recharge with fresh
refrigerant.
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 al-
most 0 when the
manifold gauges are
attached, check for any
leaks, repair them, and
evacuate the system.
D Inspect compressor and re-
pair or replace as
necessary.
D Adjust refrigerant to
specified amount.
D Clean condenser.
D Inspect and repair
condenser fan.
D Replace receiver/dryer.
D Inspect quantity of com-
pressor oil and presence of
contaminants in oil.
D Evacuate system and
recharge with fresh
refrigerant.
D Inspect if heat-sensitizing
tube is properly attached.
D Replace expansion valve.