Pressure Test Chart - Honda Civic 1998 Service Manual

A/C System Service
Pressure Test Chart
NOTE: Performance Test is on page 22-22.
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Test results
Related symptoms
Probable cause
Remedy
D i s c h a r g e ( h i g h )
pressure abnor,
m a l l y h i g h
After stopping compressor, pres-
sure drops to about 200 kPa
{2.0 kgflcm,,28 psi) quickly. and
t h e n f a l l s g r a d u a l l y .
Air in system
Recover, evacuate, and
recharge with specified amount.
Evacuation: see page 22-36
Charging: see page 22-37
R e d u c e d o r n o a i r f l o w t h r o u g h
condenser
. Clogged condenser fins
. Condenser fan not work-
ing properly
Clean.
Check voltage and fan rpm.
Check fan direction.
Line to condenser is excessively
hot.
Restricted flow of refriger
ant in system
Restricted lines
Discharge pres-
s u r e a b n o r m a l l y
High and low pressures are bal
anced soon after stopping compres-
sor. Low side is higherthan normal.
. Faulty compressor dis-
charge valve
. Faulty compressor seal
Replace the compressor.
Outlet of expansion valve is not
frosted, low pressure gauge indi-
cates vacuum.
. Faulty expansion valve
. Moisture in system
. Replace.
. Recover, evacuate. and
recharge with specified
amount.
Suction (low)
pressure abnor-
m a l l y l o w
Suction pres-
s u r e a b n o r m a l l y
h i g h
S""tl"" ""d d'; l
cnarge pres-
sures abnormally
n r g n
Expansion valve is not frosted, and
low pressure line is not cold. Low
pressure gauge indicates vacuum.
Frozen expansion valve
Faulty expansion valve
Replace the expansion valve.
Discharge temperature is low, and
the air flow from vents is restricted.
Frozen evaporator
Run the fan with compressor
off, then check A,/C thermostat.
Expansion valve is frosted.
Receiver/dryer outlet is cool, and
inlet is warm (should be warm
11lr9i!99!:!.
_
Low pressure hose and check
joint are cooler than the tempera
tu re around evaporator.
l-l,gh ""d l"* pr""sure are equal-
ized as soon as the compressor is
stopped, and both gauges fluctu
]
a t e w h i l e r u n n i n g .
Reduced air flow through con-
I
denser.
Suction pressure is lowered when
condenser is cooled by water.
Clogged expansion valve
Clogged receiver/dryer
. Expansion valve open too
l o n g
. Loose expansion capillary
t u b e
Excessive refrigerant in sys-
tem
. Faulty gasket
. Faulty high pressure valve
. Foreign particle stuck in
high pressure valve
Clean or replace.
Replace.
Repair or replace.
Recover, evacuate, and
recharge with specified amount.
Replace the compressor.
. Clogged condenser fins
. Condenser fan not work-
ing properly
Clean condenser.
Check voltage and fan rpm.
Check fan direction.
Suction and dis-
charge pressure
abnormally low
Low pressure hose and metal end
areas are cooler than evaporator.
Temperature around expansion
valve is too low compared with
that around receiver/dryer.
Clogged or kinked low pres-
sure hose parts
Repair or replace.
Clogged high pressure line
Repair or replace.
Refrigerant leaks
Compressor clutch is dirty.
Compressor shaft seal leaking Replace the compressor.
Compressor bolt{s) are dirty.
Leaking around bolt(s)
Tighten bolt(s) or replace com-
pressor.
Compressor gasket is wet with oil.
Gasket leaking
Replace the compressor.
22-24