Troubleshooting
U-22
Step Inspection Action
7
Inspect heater pipeline
l Inspect heater pipeline for the following
items.
— Is heater pipeline free of damage and
cracks?
— Are heater pipeline connections free of
engine coolant leakage?
— Are heater pipeline connections loose?
— Are heater pipeline installation points on
front a/c unit free of engine coolant
leakage?
l Are all above items normal?
Yes Operation is normal. Recheck
malfunction symptoms.
No If any heater pipeline connection is
loose, tighten to specified torque.
Repair or replace heater pipeline, go to
next step.
8
Verify if malfunction symptom occurs after
repaired.
l Does unit operate normally in every
temperature setting?
Yes Troubleshooting completed. Explain
conditions to customer.
No Recheck malfunction symptoms, and
then repeat from step 1 if malfunction
reoccurs.
Vi. Insufficient airflow or no airflow from rear air port
6 Insufficient airflow or no airflow from rear air port
Malfunction
symptom
Malfunction in air ports and/or ducts
Possible causes
Malfunction in vent mode system. Steps 1-3
Malfunction in heat mode system. Steps 4-6
Troubleshooting procedure
Step Inspection Action
1
Verify whether malfunction is in vent mode
or heat mode.
l Does air blow out under vent mode?
Yes Go to step 4.
No Go to next step.
2
Inspect air ports
l Are any air ports clogged?
Yes Remove obstruction, go to step 7.
No Go to next step.
3
Verify that roof duct is installed.
l Is rear cooling ducts 1 and 2 properly
installed?
Yes Inspect the rear cooling ducts 1 and 2 for
clogging, deformation or air leakage, go
to step 7.
No Install the rear cooling ducts 1 and 2 in
the proper position, and then go to step
7.
To Next Page
Loading...