Troubleshotting
U-35
Step Inspection Action
12
Inspect pipe joints for looseness.
l Are refrigerant pipeline joints loose?
Yes
Tighten joints to specified torque. If the
compressor generates noise, add 10ml
(l0cc.0.338 fl oz) of compressor oil to
the a/c compressor. Verify that the noise
is no longer heard.
Adjust refrigerant to specified quantity,
then go to step 19.
No
If the compressor generates noise, add
10ml (l0cc.0.338fl oz) of compressor oil
to the a/c compressor. Verify that the
noise is no longer heard.
Replace o-ring on the refrigerant
pipeline, adjust refrigerant to specified
quantity, and then go to step 19.
13
Verify whether malfunction is in expansion
valve, air mix actuator and compressor oil or
elsewhere.
l Does refrigerant high-pressure value
rapidly increase?
Yes Go to next step. (pressure rapidly
increases.)
No Go to step 16.
14
Verify whether malfunction is in compressor
oil quantity and a/c compressor or elsewhere
l With engine accelerating, does
high-pressure value increase?
Yes Return to step 3.
No Go to next step.
15
Verify whether malfunction is in compressor
oil quantity and a/c compressor.
l After compressor oil is replenished by l0ml
(l0 cc. 0.338 fl oz), does high-pressure
value increase?
Yes Troubleshooting completed. (explain to
customer that the malfunction is caused
by insufficient compressor oil)
No Replace a/c compressor, then go to step
19. (cause is defective a/c compressor.)
16
Verify whether malfunction is in expansion
valve or elsewhere.
l Is only refrigerant low-pressure value high?
Yes Replace expansion valve, then go to step
19. (replace it since expansion valve
opens too widely).
No Go to next step.
17
Verify that air mix actuator is installed firmly
and properly.
l Are front and/or rear a/c unit air mix links,
air mix rockers and shaft firmly and
properly installed?
Yes Go to next step.
No Repair or install links, rockers and shaft
firmly in proper position, then go to step
19.
To Next Page
Loading...