A/C System Tests; Pressure Test - Honda S2000 Service Manual

A/C System Tests
Pressure Test
Test results
Related svmDtoms
Probabls causo Remedv
Discharge (high)
pressure
abnormally high
Atter stopprng compressor,
pressure drops to about 196 kPa (2.0
kgt/cm', 28 psilquickly, and then
falls oraduallv.
Air in system
Hecover, evacuate (see page 2l-51),
and recharge with specified amount
(see page 21-53).
Reduced or no air flow through
conoenser
Clogged condenser or
radiator fins
Condenser or radiator fan not
workino orooerlv
C l e a n
Check voltage and fan rpm.
Check fan direction.
Line to condenser is excessively hot. Hestricted tlow of relrigerant in
Restricted lines
lJrscharge
pressure
abnormally low
High and low pressures are
balanced soon after stopping
compressor. Low side is higher than
normal.
Faulty compressor discharge
Faulty compressor seal
Replace the compressor.
Outlet of expansion valve is not
f rosted, low-pressure gauge
indicates vacuum.
Faulty expansron valve
Moisture in system
. Replace
. Recover, evacuate, and rechatge
with soecified amount.
Suctron {low)
pressure
abnormally low
Expansion valve is not frosted, and
low-oressure line is not cold. Low,
oressure oauoe indicates vacuum.
Frozen expansron valve
(Moisture in system)
F a u l t v e x o a n s i o n v a l v e
. Recover, evacuate, and recharge
with specif;ed amount.
. Reolace
Discharge temperature is low, and
the air flow from vents is restricted.
l_rozen evaporator Run the fan with compressor off,
then check evaporator temperature
sensor.
Expansion valve is frosted
Cloqqed expansion valve Clean or replace.
Receiver/dryer outlet is cool, and
inlet is warm (should be warm
du.inq oDeration)-
Clogged receivetdryer Fleplace
Suctron pressure
abnormally high
Low-pressure hose and check Ioint
are cooler than the temperature
around evaoorator.
txpansron valve open too long Repair or replace.
Suction pressure is lowered when
condenser is cooled bv water.
Excessive retrigerant in system Recover, evacuate, and recharge
with soecified amount.
High and low-pressure are
equalized as soon as the
compressor is stopped, and both
oauoes fluctuate while runnino.
Faulty gasket
Faulty high-pressure valve
Foreign panicle stuck in high-
HePlace the compressor.
Suction and
discharge
pressures
abnormallv hioh
Reduced air flow through
condenser,
Clogged condenser or
radiator fins
Condenser or radiator fan not
workino orooerlv
ulean
Check voltage and fan rpm.
Check fan direction.
Suction ancl
discharge
pressure
abnormally low
Low-pressure hose and metalend
areas are cooler than evaporatof.
Clogged or kinked low-pressure
nose oans
Bepair or replace.
Temperature around expansion
valve is too low compared with that
around receiver/rlrver
Clogged high-pressure line
Heparr or replace.
Refrigerant leaks
ComDressor ciutch is d irtv. Compressor shaft seal leakinq
ReDlace the comDressor.
Compressor bolt(s) are dirty.
Leaking around bolt(s)
I rghten bolt(s) or replace
comoressor.
ComDressor oasket is wet with oil-
Gasket leakinq Replace the compressor.