NO.3 AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE


BHE070301038W05

Manual Air Conditioner

3

Amount of air blown from vents does not change.

DESCRIPTION

• Malfunction in blower system.

POSSIBLE CAUSE

• Blower relay, blower motor, resistor, fan switch malfunction (Step 1)
• Blower unit malfunction (Steps 2-4)

Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT BLOWER SYSTEM

• Inspect the following systems and electrical parts:
– Blower relay
– Blower motor
– Resistor
– Fan switch
– Related wiring harnesses
• Are they normal?
Yes
Go to next step.
No
Repair or replace malfunctioning part, then go to Step 5.
2

CHECK TO SEE WHETHER MALFUNCTION IS IN BLOWER UNIT OR ELSEWHERE

• Turn ignition switch to ON position.
• Turn fan switch on.
• Recirculate air inside vehicle.
• Does fan in blower unit rotate smoothly?
Yes
Go to Step 4.
No
Go to next step.
3

INSPECT BLOWER UNIT

• Inspect fan in blower unit.
– Is fan free of interference from blower unit case?
– Is fan free of foreign material and obstructions?
• Is fan normal?
Yes
Go to next step.
No
Remove obstruction, repair or replace fan and blower unit case, then go to Step 5.
4

INSPECT BLOWER UNIT INTAKE VENT

• Is blower unit intake vent clogged?
Yes
Remove obstruction, then go to next step.
No
Inspect if there are any obstructions in passage between blower unit and A/C unit, then go to next step.
5

VERIFY THAT MALFUNCTION SYMPTOM OCCURS 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.