941 / 1002
HVAC
31
STEP INSPECTION
ACTION
If there is no damage, go to next step.
12
Inspect evaporator piping connec-
tions in cooling unit for looseness
Yes
Tighten connections to specified torque.
If the vane makes a noise, add 10 ml of compres-
sor oil to the A/C compressor.
Verify that the noise is no longer heard. Adjust
refrigerant to specified amounts.
No
If the vane makes a noise, add 10 ml of compres-
sor oil to the A/C compressor.
Verify that the noise is no longer heard. Replace
O-ring on piping, adjust refrigerant to specified
amounts.
13
Inspect piping connections for
looseness are piping connections
loose?
Yes
Tighten connections to specified torque. If the
vane makes a noise, add 10ml of compressor oil
to the A/C compressor. Verify that the noise is no
longer heard.
Adjust refrigerant to specified amounts.
No
If the vane makes a noise, add 10ml of compres-
sor oil to the A/C compressor.
Verify that the noise is no longer heard. Adjust
refrigerant to specified amounts.
14
Verify whether malfunction is in
expansion valve, air mix and com-
pressor oil or elsewhere does
refrigerant’s high-pressure value
hardly increases?
Yes
Go to next step.
(Pressure hardly increases.)
No
Go to step 17.
5
Verify whether a malfunction is in
compressor oil amount and a/c
compressor or elsewhere when
engine is racing, does high-
pressure value increase?
Yes
Return to step 3.
No
Go to next step
16
Verify whether malfunctions is in
compressor oil amount or a/c com-
pressor after compressor oil is
replenished each 10 ml, does high-
pressure value increase?
Yes
Troubleshooting completed. (Explain to customer
that cause was insufficient compressor oil.)
No
Replace A/C compressor. (Cause is defective AC
compressor)