Suzuki Liana RH413 Service Manual page 858

7B-19 Air Conditioning System: Manual Type
MANIFOLD GAUGE MPa (kg/cm
Lo
Normal: 0.23 – 0.35 Normal: 1.4 – 1.75
(2.3 – 3.5) (33 – 50) (14 – 17.5) (200 –
↑ ↓
249)
↑ ↓
Abnormal: Negative
pressure Abnormal: 0.7 – 1.0
(7 – 10) (100 – 142)
0.05 – 0.15 (0.5 – 0.7 – 1.0 (7 – 10)
1.5) (4.2 – 21.3) (100 – 142)
0.4 – 0.6 (4 – 6)
(56.9 – 85.3)
0.35 – 0.45 (3.5 – 2.0 – 2.5 (20 – 25)
4.5) (50 – 64) (285 – 355)
0.45 – 0.55 (4.5 –
5.5) (64 – 78)
Condition
2 ) (psi)
Detail
Hi
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.
Both low and high
pressure sides indicate
low readings.
Continuous air bubbles
are visible through sight
glass.
Output air is slightly cold.
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.
Pressure on both low and
high pressure sides is
high.
Air bubbles are not visible
even when engine rpm is
lowered.
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.
High pressure reading on
both low and high
pressure sides.
Large amount of frost or
dew on the low pressure
side tubing.
Possible Cause
Expansion valve is Replace expansion
frozen due to valve.
moisture in the Replace receiver /
system, and dryer.
temporarily shuts off Evacuate A/C system
the refrigeration and recharge with
cycle. fresh refrigerant.
Insufficient refrigerant Using leak detector,
in system check for leaks and
(Refrigerant leaking). 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.
Internal leak in Inspect compressor
compressor. and repair or replace
as necessary.
Overcharged A/C Adjust refrigerant to
system. specified amount.
Faulty condenser Clean condenser.
cooling operation.
Faulty radiator or Inspect and repair
condenser cooling radiator or condenser
fan operation. cooling fan.
Presence of air in A/C Replace receiver /
system dryer.
(Improperly Inspect quantity of
evacuated). compressor oil and
presence of
contaminants in oil.
Evacuate system and
recharge with fresh
refrigerant.
Faulty expansion Replace expansion
valve. valve.
Refrigerant flow is not
regulated properly.
Correction