Pressure Test - Honda Acura NSX 1991 Service Manual

Pressure Test

NOTE: Performance Test on page 22-96.
TFCT RF91
II l-C
After stopping compressor, pressure
Discharge (high)
drops to about 196 kPa (28 psi)
pressure abnormally
quickly, and then falls gradually
No bubbles in sight glass when con-
denser is cooled by water
Reduced or no air flow through con-
denser.
Line to condenser is excessively hot
Excessive bubbles in sight glass;
Discharge pressure
abnormally low condenser is not hot
High and low pressures are balanced
soon after stopping compressor
Outlet of expansion valve is not
frosted, low pressure gauge indi-
cates vacuum
Excessive bubbles in sight glass;
Suction flow)
pressure abnormally condenser is not hot
l o w
Expansion valve is not frosted and
low pressure line is not cold. Low
pressure gauge indicates vacuum
Discharge temperature is low and
the air flow from vents is restricted
Expansion valve frosted
Receiver dryer is cool (should be
warm during operation)
Low pressure hose and check joint
Suction pressure
are cooler than around evaporator
abnormally high
Suction pressure is lowered when
condenser is cooled by water
High and low pressure are equalized
as soon as the compressor is
stopped
Reduced air flow through condenser
Suction and
discharge pressures
abnormally high
No bubbles in sight glass when con-
denser is cooled by water
Suction and Low pressure hose and metal end
areas are cooler than evaporator
discharge pressure
abnormally low
Temperature around expansion valve
is too low compared with that
around receiver-dryer
Compressor clutch is dirty
Refrigerant leaks
Compressor bolt(s) are dirty
Compressor gasket is wet with oil
22-98
PROBABLE CAUSE
Air in system
Excessive refrigerant in
system
Clogged condenser or radiat-
l
er fins
Condenser or radiator fan not
l
working properly
Restricted flow of refrigerant
in system
insufficient refrigerant in
system
Faulty compressor discharge
l
o r i n l e t v a l v e
Faulty compressor seal
l
Faulty expansion valve
l
Insufficient refrigerant
Frozen expansion valve
l
Faulty expansion valve
l
Frozen evaporator
Clogged expansion valve
Clogged receiver dryer
Expansion valve open too long
l
Loose expansion valve
l
Excessive refrigerant in
system
Faulty gasket
l
Faulty high pressure valve
l
Foreign particle stuck in high
l
pressure vlave
Clogged condenser or radiator
l
fins
Condenser or radiator fan not
l
working properly
Excessive refrigerant in
system
Clogged or kinked low pres-
sure hose parts
Clogged high pressure line
Compressor shaft seal leaking
Leaking around bolt(s)
Gasket leaking
R E M E D Y
Evacuate system: then
recharge
Evacuation: page 22-93
Recharging: page 22-95
Discharge refrigerant as
necessary
Clean
l
Check voltage and fan rpm
l
Expansion valve
Check for leak
l
Charge system
l
Replace compressor
Replace
Check for leaks.
Charge as required.
Replace expansion valve
Run the fan with compressor
off then check capillary tube.
Clean or Replace
Replace
Repair or Replace.
Discharge refrigerant as
necessary
Replace compressor
Clean condenser and radiator
l
Check voltage and fan rpm
l
Discharge refrigerant as
necessary.
Repair or Replace
Repair or Replace
Replace compressor
Tighten bolt(s) or replace
compressor
Replace compressor