Troubleshooting
U-36
Step Inspection Action
18
Adjust compressor oil
l Set front fan switch at 4th position.
l Turn the a/c switch on.
l Set to fresh mode.
l Set the temperature control to max cold.
l Set to vent mode.
l Run engine with constant speed of
1.500rmp for 10 minutes.
l Run engine with idling speed for 1 minute.
l An engine speed cycle is defined as going
from idling speed to 4,000rmp and back to
idling speed over a period of 12 seconds.
Perform 5 cycles.
l Run engine with idling speed for 30
seconds.
l Drain all oil from a/c compressor and verify
whether the quantity is 100ml (100cc,
3.38fl oz).
l If the quantity is more than 100ml (l00
cc,3.38 fl oz), only charge 100ml (100 cc,
3.38 fl 0z) of compressor oil back.
l Repeat above steps 1-10, and verify
whether the compressor oil quantity is
100ml (100cc, 3.38fl oz).
l Is there 100ml (100 cc, 3.38 fl 0z) oil in a/c
compressor?
Yes Go to next step.
No Conduct as step 1-10, till oil volume of
compressor is 100ml (l00 cc, 3.38 fl oz).
19
Verify whether malfunction symptom occurs
after repair.
l Does cold air blow out (if the result of
cooling system performance test is normal?
Yes Troubleshooting completed. Explain
causes to customer.
No Recheck malfunction symptoms, then
repeat from step 1 if malfunction
reoccurs.
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