Suzuki WagonR+ RB310, Service Manual

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1B-10 AIR CONDITIONING (OPTIONAL)
DETAIL DIAGNOSIS TABLE AT AMBIENT TEMPERATURE WITHIN 30 – 35
"
C (85 – 95
"
F)
MANIFOLD
GAUGE
MPa
kg/cm
2
psi
CONDITION 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
!
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 receiver/dryer.
!
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
!
During A/C operation,
the low pressure side
sometimes indicates
negative pressure, and
sometimes normal pres-
sure. 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 receiver/dryer.
!
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
!
Both low and high
pressure sides indicate
low readings.
!
Continuous air bubbles
are visible through sight
glass.
!
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 at-
tached, 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.
0.35 – 0.45
!
High pressure reading
on both low and high
pressure sides.
!
Air bubbles are not
visible even when
engine rpm is lowered.
!
Overcharged A/C
system.
!
Faulty condenser
cooling operation.
!
Faulty condenser fan
operation.
!
Adjust refrigerant to
specified amount.
!
Clean condenser.
!
Inspect and repair
condenser fan.
0 35 0 5
3.5 – 4.5
50 – 64
1.96 – 2.45
20 – 25
285 – 355
!
High pressure reading
on both low and high
pressure sides.
!
Low pressure side tubing
is not cold when touched.
!
Air bubbles are visible
through sight glass.
!
Presence of air in
A/C system.
(Improperly evacuated)
!
Replace receiver/dryer.
!
Inspect quantity of com-
pressor 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.