Suzuki Liana RH413, Service Manual

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Air Conditioning System: Manual Type 7B-18
9) Check for crossing point of center ventilation louver
air temperature and recirculation air inlet
temperature if it is within shaded range of graph.
For example, if inlet temperature is 25
°
C (75
°
F) and
center ventilation louver temperature is 8
°
C (46
°
F),
their crossing point is within acceptable range as
shown in graph.
If crossing point is out of acceptable range, diagnose
trouble referring to the following table.
Crossing point of center ventilation louver
temperature and recirculation air inlet temperature
NOTE
If ambient temperature is approximately 30
°
C (86
°
F), it is possible to diagnose A/C system in detail
referring to the following table.
I2RH01720009-01
Condition Possible Cause Correction
Crossing
point is
higher than
acceptable
range (“E”
area) Insufficient or excessive
charge of refrigerant Check refrigerant
pressure.
Dirty or bent A/C
evaporator fins Clean or repair.
Air leakage from cooling
(heater) unit or air duct Repair or
replace.
Malfunctioning, switch
over function of door in
cooling (heater) unit Repair or
replace.
Compressor
malfunction Check
compressor.
Crossing
point is
lower than
acceptable
range (“F”
area) Insufficient air volume
from center duct (Heater
blower malfunction) Check blower
motor and fan.
Compressor
malfunction Check
compressor.
Condition
Possible Cause Correction MANIFOLD GAUGE MPa (kg/cm 2 ) (psi)
Detail
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.