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HVAC
28
STEP INSPECTION
ACTION
11
Inspect evaporator piping connec-
tions in cooling unit for gas leakage
are piping connections for evapora-
tor in cooling unit free of gas
leakage?
Yes
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.
No
If piping is damaged or cracked, replace it.
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.
15
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