Pressure Test Chart - Honda CR-V 1997 Service Manual

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System Service
Pressure Test Chart
NOTE: Performance Test is on page 22-56.
Test results
Related symptoms
Probabtecause
Remedy
Discharge (high)
After stopping compressor, pressure Air in system
Discharge, evacuate, and recharge
pressure abnormally
drops to a bout 200 kPa (2.0 kgf/cm2,
with specified amount.
high
28 psi ) quickly. and then falls gradually.
Evacuation: see page 22-60
Charging: see page 22-61
No bubbles in sight glass when
Excessive refrigerant in system
Discharge, evacuate, and recharge
co ndenser is cooled by water with specified amount.
Aeduced or no air flow through
• Clogged condenser or radia-
• Clean
condenser
tor fins
• Check voltage and fan rpm.
• Condenser or radiator fan
• Check fan direction.
not working pro perly
line to condenser is excessively hot.
Restricted flow of refrigerant in
Restricted lines
system
Discharge pressure Excessive bubbles in sight glass;
Insufficient refrigerant in • Check for leak.
abnormally low condense r is not hot. system
• Charge system .
High and low pressures are balanced
• Faulty co mpressor discharge
Replace the compressor.
soon after stopping compressor. Low valve
side is higher than normal.
• Faulty compressor seal
Outlet of expansion valve is not
.. Faulty expansion valve
• Replace
frosted, low-pressure gauge indicates • Moisture in system
• Discharge, evacuate, and
vacuum . recharge with specified amount.
Suctio n (low) pres-
Excessive bubbles in sight glass; Insufficient refrigerant in
• Repair the leaks.
sure abnormally
condenser is not hot. system
• Discharge, evacu ate, and
low recharge with specified amount.
• Charge as required.
Expansion valve is not frosted. and • Frozen expansion valve • Discharge, evacuate, and
low-pressure line is not cold, Low-
(Moisture in system) recharge with specified amount.
pressure gauge indicates vacuum. .. Faulty expansion valve • Replace the expansion valve.
Discharge temperature is low, and the Frozen evaporator
Run the fan with compressor off.
air flow from vents is restricted.
then check evaporator tempera -
ture sensor.
Expansi on valve is frosted . Clogged expansion valve Clean or replace .
Receiver/dryer outlet is cool, and inlet
Clogged receiver/dryer
Replace
is warm (should be warm during
operation).
Suction pressure Low-pressure hose and check joint are
• Expansion valve open too long Repa ir or replace.
abnormally high cooler than the temperature around
• Loose expansion capillary
evaporator. tube
Suction pressure is lowered when
Excessive refrigerant in system
Discha rge, evacuate, and recharge
condenser is cooled by water.
with specified amount.
High and low-pressure are equalized • Faulty gasket
Replace the compressor.
as soon as the compressor is stopped, • Faulty high-pressure valve
and both gauges fluctuate while
.. Foreign particle stuck in high-
running. pressure valve
Suction and dis-
Reduced air flow through condenser,
• Clogged condenser or
• Clean
charge pressures radiator fins
• Check voltage and fan rpm.
abnormally high • Condenser or radiator fan
.. Check fan direction.
not working properly
No bubbl es in sight glass when
Excessive refrigerant in system
Discharge, evacuate, and recharge
condenser is cooled by water
with specified amount.
Suction and dis- low-pressure hose and metal end Clogged or kinked low·
Repair or replace.
charge pressure areas are cooler than evaporator. pressu re hose pa rts
abnormally low
Temperature around expansion valve
Clogged high-pressure line Repair or replace.
is too low compared with that around
receiver/dryer.
Refrigerant leaks Compressor clutch is dirty. Compressor shaft seal leaking
Replace the compressor.
Compressor bolt(s) are dirty. Leaking around
b o lt~s)
Tighten bolt(s) or replace
compressor.
Compressor gasket is wet with oil. Gasket leakin g
Replace the com pressor.
22-58