Acura 1994 Integra Service Manual page 1089

Pressure Test Chart
NOTE: Performance Test on page 22-24.
TEST RESULTS
RELATED SYMPTOMS
PROAABLE CAUSE
REMEDY
Dischsrge
(high) pressure
abnormally
n r g n
AftEr stopping compressor, pressure
drops to about 200 kPa (2.0 kof/cmr. 28
psi) quickly, and then falls gr;dua y.
Air in system
Recover, evacuate and recharqo
with sDecified amount.
-
Evacuation: see Daqe 22-38
Charoino: se6 D;op--2?-?q
No bubbles in sight g16ss when con-
denser is cooled bv water.
E-\cessive refrigerant in sys-
Recover, evacuate and recharqe
with specitied amount.
-
Reduced or no air flow through con-
oenser.
Clogged condenser or
radiato. fins
Condenser o. radiator fan
not working properly
Clean
Check voltage and fan rpm
unecK lan ofeclton
Line to condenser is excessivelv hot.
Restricted flow of refriger-
ant In syslem
. Restricted lines
Discharge pres-
su re abnormal-
Excossive bubbles in sight glass;
condenser is not hot.
Insuff icient refrigerant in
syslem
Check for leak
Charge system
High and low pressures are balanced
soon after stopping compressor. Low
side is higher than normal,
Faulty compressor dis-
cnarge vaNs
Faulty compressor seal
Replace the compressor.
Outlet of expansion vslve is not frost-
ed, low pressure gauge indicates vacu-
u m ,
. Faulty expansion valve
. Moisture in sysiem
. Replace
. Recover, evacuate and recharoe
with specified amount.
-
Suction (lowl
pressure
abnormally low
Excessive bubbles in sight glass;
conqenser rs not hot_
Insuff icient ref rigerant
Reoair the leaks.
Reaover, evacuate and recharoe
with sDecifisd amount.
-
Charqe as required.
Expansion valve is not trosted and low
pressur€ line is not cold. Low pressure
gauge Inorcates vacuum.
Frozen expansion valve
Faulty expansion valve
Replace the expansion valve.
Discharge temperaturg is low and the
air flow from vents is restricted.
Froren evaporator
Run the tan with comoressor oft
then check Ay'C thermostat.
Expansion valve is frost€d.
Clogged expansion valve
Cl€an or replace.
Receiver/dryer outlet is cool and inlet
isrryarm (should be warm during oper-
Clogged r€ceiver/dry€r
Replace
Suction pres-
su re abnormal-
ly high
Low pressure hose and check joint are
cooler than the temDeraturo around
evaDorator.
'
ffin"nsion
u"lu" oD"n too
. Loose expansion capillary
Repair or replace.
Suction pressure is lowered when con-
denser is cooled by water,
Excessive refrigerant in sys-
rem
Recover, evacuate and recharqe
with sDecifi€d amount.
-
High and low pressure are equalized
as soon as the compressor is stopped,
and both gauges fluctuate while run-
n r n g .
Faultv oasket
Faulty Figh pressure valve
Foreign particle stuck in
high pressure valve
Replace the compressor.
Suction and
discharg€ pres-
sufes aonor-
mally high
Reduced air flow through condenser. . Clogged condenser or
radiator fins
. Condenser or radiator fan
not working properly.
Clean condenser and radiator
Check voltage and fan rpm
Check fan direcrion
No bubbles in sight glass when con-
cl€nser is cooled bv water.
Excessive refrigerant in sys-
rem
Rgcover, €vacuate and recharoe
with sp€cified amount.
Suction snd
discharge pres-
su r€ abnormal-
Low pressure hose and metal end
afeas are cooler than evaDorator.
Clogged or kinked tow pre€-
sure nos€ pans
Fepair or replace.
Temperature around expansion valve
is too low compared with that around
recerver/orver.
Clogged high pressure line
Repair or replace.
Refrig€rant
leaks
Compressor clutch is dirty.
Compressor shaft seal leak-
I n g
Replace the comDressor.
Compressor bolt(s) are dirty.
Leaking around bolt(s)
Tighten bolt(sl or replace com-
pressor.
Compressor gasket is wet with oil.
I Gasket leaking
Replace the compressor.
22-23