Pressure Test Chart - Acura 3.5 RL Manual

A/C System Service

Pressure Test Chart

NOTE: Performance Test is on page 22-76.
Test results
Discharge (high) After stopping compressor, pres-
pressure abnor- sure drops to about 200 kPa
mally high (2.0 kgf/cm
then falls gradually.
Reduced or no air flow through
condenser
Line to condenser is excessively
hot.
Discharge pres-
High and low pressures are bal-
sure abnormally anced soon after stopping compres-
sor. Low side is higher than normal.
low
Outlet of expansion valve is not
frosted, low-pressure gauge indi-
cates vacuum.
Suction (low) Expansion valve is not frosted, and
pressure abnor- low-pressure line is not cold. Low-
pressure gauge indicates vacuum.
mally low
Discharge temperature is low, and
the air flow from vents is restricted.
Expansion valve is frosted.
Receiver/dryer outlet is cool, and
inlet is warm (should be warm
during operation).
Suction pres- Low-pressure hose and check
sure abnormally joint are cooler than the tempera-
high ture around evaporator.
Suction pressure is lowered when
condenser is cooled by water.
High and low pressure are equal-
ized as soon as the compressor is
stopped, and both gauges fluctu-
ate while running.
Suction and dis- Reduced air flow through con-
charge pres- denser.
sures abnormally
high
Suction and dis- Low-pressure hose and metal end
charge pressure areas are cooler than evaporator.
abnormally low
Temperature around expansion
valve is too low compared with
that around receiver/dryer.
Refrigerant leaks Compressor clutch is dirty.
Compressor bolt(s) are dirty.
Compressor gasket is wet with oil.
Related symptoms
2
, 28 psi) quickly, and
Probable cause
Air in system
• Clogged condenser or
radiator fins
• Condenser or radiator fan
not working properly
Restricted flow of refriger-
ant in system
• Faulty compressor dis-
charge valve
• Faulty compressor seal
• Faulty expansion valve
• Moisture in system
• Frozen expansion valve
• Faulty expansion valve
Frozen evaporator
Clogged expansion valve
Clogged receiver/dryer
• Expansion valve open too
long
• Loose expansion capillary
tube
Excessive refrigerant in sys-
tem
• Faulty gasket
• Faulty high-pressure valve
• Foreign particle stuck in
high-pressure valve
• Clogged condenser or
radiator fins
• Condenser or radiator fan
not working properly
Clogged or kinked low-
pressure hose parts
Clogged high-pressure line
Compressor shaft seal leaking
Leaking around bolt(s)
Gasket leaking
Remedy
Recover, evacuate, and
recharge with specified amount.
Evacuation: see page 22-88
Charging: see page 22-89
• Clean.
• Check voltage and fan rpm.
• Check fan direction.
Restricted lines
Replace the compressor.
• Replace.
• Recover, evacuate, and
recharge with specified amount.
Replace the expansion valve.
Run the fan with compressor
off, then check evaporator
temperature sensor.
Clean or replace.
Replace.
Repair or replace.
Recover, evacuate, and
recharge with specified amount.
Replace the compressor.
• Clean condenser and radia-
tor.
• Check voltage and fan rpm.
• Check fan direction.
Repair or replace.
Repair or replace.
Replace the compressor.
Tighten bolt(s) or replace com-
pressor.
Replace the compressor.