A/C System Tests; Pressure Test - Honda EP3 Service Manual

A/C System Tests
Pressure Test
Test results svmotom3
D G a U S e
Discharge (high)
pressure
abnormally high
After stopping compressor, pressure
drops quickly, and then continues to
Air in system
Recover, evacuate (see page 21-54),
and recharge with specified amount
{see oaoe 21 55).
Beduced or no air flow through
condenser
Clogged condenser or radiator
fins
Condenser or radiator fan not
Clean
Check fan voltage and rpm.
Check fan direction.
Line to condenser is excessively hot.
Restricted flow of refrigerant in
Replace restricted lines.
Discharge pressure High and low pressures are balanced
soon after stopping compressor, Low
side is hioherthan normal.
. Faulty compressor discharge
valve
. Faultv comoressor seal
Beplace the compressor.
Outlet of expansion valve is not
frosted, low pressure gauge indicates
Faulty expansion valve
Moisture in system
. Replace the expansion valve.
. Recover, evacuate for at least
30 minutes, and recharge with
sDecified amount.
Suction (low)
pressure
abnormally low
Expansion valve is not frosted, and
low-pressure line is not cold. Low
pressure gauge indicates vacuum,
' Frozen expansion valve
(Moisture in system)
. Faulty expansion valve
Recover, evacuate for at least
30 minutes, and recharge with
specified amount.
Beplace 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 evaooratot temoerature sensor.
Exoansion valve is frosted.
ean or reolace,
Receivetdryer outlet is cool, and inlet
is warm (should be warm during
ooeralton),
Clogged receiver/dryer
Replace receaver/dryer.
Suction pressure
abnormally high
Low pressure hose and check joint are
cooler than the temperature around
evaoorator,
E x p a n s i o n v a l v e o p e n t o o l o n g
Bepair or replace.
Suction pressure is lowered when
. . n r l e n s e r i s c o o l e d b v w a t e r .
Excessive refrigerant in system
Recover, evacuate, and recharge with
q n p . i f i e . l a m o ' r n r
High and low pressure are equalized
as soon asthecompressor is stopped,
and both gauges fluctuate while
Faulty gasket
Faulty high pressure valve
Foreign panicle stuck in high
Replace the compressor.
Suction and
dascharge
pressures
abnormallv hioh
Reduced air flow through condenser. . Clogged condenser or radiator
fins
' Condenser or radiator fan not
workino orooerlv
Clean
Check voltage and fan rpm.
Check fan direction.
Suction and
discharge pressure
abnormally low
Low-pressure hose and metalend
areas are coolerthan evaoorator,
Clogged or kinked low-pressure
hose oarts
Repair or replace.
Temperature around expansion valve
is too low compared with that around
C l o g g e d h i g h - p r e s s u r e l i n e
Repair or replace,
Fefrigerant leaks
:omoressor clulch is dirtv.
:omoressor shaft seal leakinq Reolace the comDressor,
lomoressor bolt(s) are dirtv.
no around bolt(s)
Tiohten bolt{s) ot reolace comDressor,
; o m D r e s s o r o a s k e t i s w e t w i t h o i l . i e t
no
ace the comoressor.
( c o n t ' d )
21-57