Suzuki Liana RH413, Service Manual

Page: 856 / 1302

7B-17 Air Conditioning System: Manual Type
8) Check for each pressure of low side and high side if
it is within shaded range of graph.
If each gauge reading is out of specified pressure,
correct defective part referring to the table.
NOTE
Pressure registered on gauge varies with
ambient temperature. Therefore, use the
graphs when determining if pressures are
normal or not.
Low side and high side pressure example,
Gauges should read as follows when ambient
temperature is 30
°
C (86
°
F)
Pressure on high pressure gauge: 1400 – 1750
kPa (14.0 – 17.5 kg/cm
2 , 199.1 – 248.9 psi)
Pressure on low pressure gauge: 230 – 350 kPa
(2.3 – 3.5 kg/cm
2 , 32.7 – 49.8 psi)
High pressure gauge
Low pressure gauge
I2RH01720008-01
Condition Possible Cause Correction
Pressure is
higher than
acceptable
range (“A”
area) Refrigerant
overcharged Recharge.
Expansion valve frozen
or clogged Check
expansion valve.
Clogged refrigerant
passage of high side Clean or
replace.
Radiator or condenser
cooling fan malfunction
(Insufficient cooling of
condenser) Check radiator
or condenser
cooling fan.
Dirty or bent condenser
fins (Insufficient cooling
of condenser) Clean or repair.
Compressor
malfunction (Insufficient
oil etc.) Check
compressor.
Engine overheat Check engine
cooling system
referring to
“Engine Cooling
System
Inspection and
Cleaning in
Section 1F”.
Pressure is
lower than
acceptable
range (“B”
area) Insufficient refrigerant
(Insufficient charge or
leakage) Check for
leakage, repair if
necessary and
recharge.
Expansion valve
malfunction (valve
opens too wide) Check
expansion valve.
Compressor
malfunction (Insufficient
compression) Check
compressor.
Condition Possible Cause Correction
Pressure is
higher than
acceptable
range (“C”
area) Expansion valve
malfunction (valve
opens too wide) Check
expansion
valve.
Compressor
malfunction (Insufficient
compression) Check
compressor.
Pressure is
lower than
acceptable
range (“D”
area) Insufficient refrigerant
(Insufficient charge or
leakage) Check for
leakage, repair
if necessary
and recharge.
Expansion valve
malfunction (valve
opens too narrow) Check
expansion
valve.
Clogged refrigerant
passage (crashed pipe) Repair or
replace.