Suzuki Liana RH413 Service Manual page 857

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.
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.
MANIFOLD GAUGE MPa (kg/cm
Lo
0.23 – 0.35 (2.3 – 1.4 – 1.75 (14 – 17.5)
3.5) (33 – 50) (200 – 249)
Negative pressure 0.5 – 0.6 (5 – 6) (71.2
– 85.3)
I2RH01720009-01
Condition
2 ) (psi)
Detail
Hi
Normal condition
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.
Air Conditioning System: Manual Type 7B-18
Crossing point of center ventilation louver
temperature and recirculation air inlet temperature
Condition Possible Cause
Crossing Insufficient or excessive
point is charge of refrigerant
higher than Dirty or bent A/C
acceptable evaporator fins
range ("E" Air leakage from cooling
area) (heater) unit or air duct
Malfunctioning, switch
over function of door in
cooling (heater) unit
Compressor
malfunction
Crossing Insufficient air volume
point is from center duct (Heater
lower than blower malfunction)
acceptable Compressor
range ("F" malfunction
area)
Possible Cause
—
Dust particles or
water droplets are
either stuck or frozen
inside expansion
valve, preventing the
refrigerant from
flowing
Correction
Check refrigerant
pressure.
Clean or repair.
Repair or
replace.
Repair or
replace.
Check
compressor.
Check blower
motor and fan.
Check
compressor.
Correction
—
Clean expansion
valve.
Replace it if it cannot
be cleaned.
Replace receiver /
dryer.
Evacuate the A/C
system and recharge
with fresh refrigerant.