Suzuki sq-416-420-625 Service Manual page 86

AMBIENT TEMPERATURE WITHIN 30 – 35_C (85 – 95_F)
MPa
MANIFOLD
(kg / cm
GAUGE
(psi)
Lo Hi
0.23 – 0.35 1.4 – 1.75
(2.3 – 3.5) (14 – 17.5)
(33 – 50) (200 – 249)
0.5 – 0.6
Negative
(5 – 6)
pressure
(71.2 – 85.3)
Normal: Normal:
0.23 – 0.35 1.4 – 1.75
(2.3 – 3.5) (14 – 17.5)
(33 – 50) (200 – 249)
" # " #
Abnormal: Abnormal:
Negative 0.69 – 0.98
(7 – 10)
pressure
(100 – 142)
0.05 – 0.15
(0.5 – 1.5)
(4.2 – 21.3)
0.69 – 0.98
(7 – 10)
(100 – 142)
0.4 – 0.6
(4 – 6)
(56.9 – 85.3)
0.35 – 0.45 0 35 0 45
(3.5 – 4.5)
(50 – 64)
1.96 – 2.45
(20 – 25)
(285 – 355)
0.45 – 0.55
(4.5 – 5.5)
(64 – 78)
CONDITION
2
)
DETAIL
Normal condition.
D The low pressure side
reads a negative pressure,
and the high pressure side
reads an extremely low
pressure.
D Presence of frost around
tubing to and from receiver /
dryer and expansion valve.
D 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.
D Both low and high pressure
sides indicate low readings.
D Continuous air bubbles are
visible through sight glass.
D Output air is slightly cold.
D Pressure on low pressure
side is high.
D Pressure on high pressure
side is low.
D Both pressure becoming
equal right after A / C is
turned OFF.
D High pressure reading on
both low and high pressure
sides.
D Air bubbles are not visible
even when engine rpm is
lowered.
D High pressure reading on
both low and high pressure
sides.
D Low pressure side tubing is
not cold when touched.
D Air bubbles are visible
through sight glass.
D High pressure reading on
both low and high pressure
sides.
D Large amount of frost or
dew on the low pressure
side tubing.
AIR CONDITIONING (OPTIONAL) 1B-15
CAUSE
——
D Dust particles or water
droplets are either stuck or
frozen inside expansion
valve, preventing the
refrigerant from flowing.
D Expansion valve is frozen
due to moisture in the
system, and temporarily
shuts off the refrigeration
cycle.
D Insufficient refrigerant in
system. (Refrigerant
leaking)
D Internal leak in compressor.
D Overcharged A / C system.
D Faulty condenser cooling
operation.
D Faulty condenser fan
operation.
D Presence of air in A / C
system. (Improperly
evacuated)
D Faulty expansion valve.
D Refrigerant flow is not
regulated properly.
CORRECTION
——
D Clean expansion valve.
Replace it if it cannot be
cleaned.
D Replace receiver / dryer.
D Evacuate the A / C
system and recharge
with fresh refrigerant.
D Replace expansion
valve.
D Replace receiver / dryer.
D Evacuate A / C system
and recharge with fresh
refrigerant.
D Using a gas leak
detector, check for leaks
and repair as necessary.
D 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.
D Inspect compressor and
repair or replace as
necessary.
D Adjust refrigerant to
specified amount.
D Clean condenser.
D Inspect and repair
condenser fan.
D Replace receiver / dryer.
D Inspect quantity of
compressor oil and
presence of
contaminants in oil.
D Evacuate system and
recharge with fresh
refrigerant.
D Replace expansion
valve.