Troubleshotting
U-31
Step Inspection Action
16
Verify whether malfunction is in air mix
actuator or elsewhere.
l Turn ignition switch to on position.
l Set rear main fan switch at 3rd position.
l Does temperature of air blown out change
easily with air mix rocker operated
manually?
Yes Go to next step.
No Go to step 18.
17
Inspect air mix actuator.
l Inspect air mix actuator. (see u-30, air mix
actuator inspection)
l Is it normal?
Yes Go to next step.
No Replace air mix actuator, go to step 21.
18
Inspect rear a/c unit
l Is rear a/c unit air mix control valve
clogged with foreign material?
Yes Remove obstruction, go to step 21.
No Go to next step.
19
Inspect rear a/c unit’s air mix control valve.
l Inspect rear a/c unit’s air mix control valve
for the following items.
— Is there any damage or crack with the air
mix control valve?
— Is air mix control valve firmly installed at
proper position?
l Are all above items normal?
Yes Go to next step.
No Replace air mixing control valve or
install it in proper position firmly, go to
step 21.
20
Inspect heater pipeline
l Inspect heater pipeline for the following
items.
— Is there any damage or crack with the
heater pipeline?
— Is there any coolant leakage with the heater
pipeline joints?
— Is there loose with the heater pipeline
joints?
— Is there any leakage with connection
between the heater pipeline and the rear
a/c unit?
l Are all above items normal?
Yes Replace rear climate control unit and
turn to next step. If the heater pipeline
is
loose, tighten to specified
torque.
No Repair or replace heater pipeline, go to
next step.
21
Verify whether malfunction symptom occurs
after repair.
l Does rear climate control unit operate well
at different temperature?
Yes Troubleshooting completed. Explain
causes to customer.
No Recheck malfunction symptoms, repeat
from step 1 if malfunction reoccurs.
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