Honda 2004 Odyssey Service Manual page 1593

Heating/Air Conditioning
A/C System Test (cont'd)
Pressure Test
Test results
Discharge After stopping compressor,
(high) pressure drops to about 196 kPa
pressure (2.0 kgf/cm , 28 psi) quickly, and
abnormally then falls gradually.
high Reduced or no airflow through
condenser
Line to condenser is excessively
hot.
Discharge High and low pressures are
pressure balanced soon after stopping
abnormally compressor. Low side is higher
low than normal.
Outlet of expansion valve is not
frosted, low-pressure gauge
indicates vacuum.
Suction (low) Expansion valve is not frosted,
pressure and low-pressure line is not cold.
abnormally Low-pressure gauge indicates
low vacuum.
Discharge temperature is low, and
the airflow from vents is restricted.
Expansion valve is frosted.
Suction Low-pressure hose and check
pressure joint are cooler than the
abnormally temperature around evaporator.
high Suction pressure is lowered when
condenser is cooled by water.
High and low-pressure are
equalized as soon as the
compressor is stopped, and both
gauges fluctuate while running.
Suction and Reduced airflow through
discharge condenser.
pressures
abnormally
high
Suction and Low-pressure hose and metal end
discharge areas are cooler than evaporator.
pressure Temperature around expansion
abnormally valve is too low compared with
low that around receiver/dryer.
Refrigerant Compressor clutch is dirty.
leaks
Compressor bolt(s) are dirty.
Compressor gasket is wet with oil.
21-62
Related symptoms
2
Probable cause
Air in system
• Clogged condenser or
radiator fins
• Condenser or radiator
fan not working
properly
Restricted flow of
refrigerant in system
• Faulty compressor
discharge valve
• Faulty compressor seal
• Faulty expansion valve
• Moisture in system
• Frozen expansion valve
(Moisture in system)
• Faulty expansion valve
Frozen evaporator
Clogged expansion valve
Expansion valve open too
long
Excessive refrigerant in
system
• 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 (see page 21-
57), and recharge with specified
amount (see page 21-58).
• Clean
• Check voltage and fan rpm.
• Check fan direction.
Restricted lines
Replace the compressor.
• Replace
• Recover, evacuate, and
recharge with specified
amount.
• 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.
Repair or replace.
Recover, evacuate, and
recharge with specified amount.
Replace the compressor.
• Clean
• Check voltage and fan rpm.
• Check fan direction.
Repair or replace.
Repair or replace.
Replace the compressor.
Tighten bolt(s) or replace
compressor.
Replace the compressor.