NO.1 INSUFFICIENT AIR (OR NO AIR) BLOWN FROM VENTS


BHE070301038W03

1

Insufficient air (or no air) blown from vents.

DESCRIPTION

• Problem with each vent or duct or both.
• Airflow mode does not change.

POSSIBLE CAUSE

• Malfunction in airflow mode actuator (Step 1)
• Malfunction in VENT mode system (Steps 2-5)
• Malfunction in HEAT mode system (Step 6)
• Malfunction in DEFROSTER mode system (Steps 7-9)

Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT AIRFLOW MODE ACTUATOR

• Inspect airflow mode actuator. (See AIRFLOW MODE ACTUATOR INSPECTION.)
• Is it normal?
Yes
Go to next step
No
Repair or replace malfunctioning part in accordance with further inspection result. (See AIRFLOW MODE ACTUATOR INSPECTION.)
2

INSPECT TO SEE WHETHER MALFUNCTION IS IN VENT MODE OR OTHER MODES

• Does air blow out when in VENT mode?
Yes
Go to Step 5.
No
Go to next step.
3

INSPECT VENT

• Is vent clogged?
Yes
Remove obstruction, then go to Step 9.
No
Go to next step.
4

VERIFY THAT DUCT IN DASHBOARD IS INSTALLED

• Is duct in dashboard properly installed?
Yes
Inspect duct for clogging, deformity and air leakage, then go to Step 9.
No
Install duct securely in the proper position, then go to Step 9.
5

INSPECT TO SEE WHETHER MALFUNCTION IS IN HEAT MODE OR DEFROSTER MODE

• Does air blow out when in HEAT mode?
Yes
Go to next step.
No
Inspect vent for clogging, then go to Step 9.
6

INSPECT DEFROSTER MODE

• Does air blow out when in DEFROSTER mode?
Yes
Operation is normal. Recheck malfunction symptoms.
No
Go to next step.
7

INSPECT VENT

• Is vent clogged?
Yes
Remove obstruction, then go to Step 9.
No
Go to next step.
8

VERIFY THAT DEFROSTER DUCT IS INSTALLED

• Is defroster duct properly installed?
Yes
Inspect duct for clogging, deformity, and air leakage, then go to next step.
No
Install duct securely in proper position, then go to next step.
9

CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR

• Does air blow out?
Yes
Troubleshooting completed.
Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.