NO.2 AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE

id070300800500

2
Amount of air blown from vents does not change.
DESCRIPTION
•  Malfunction in blower system.
POSSIBLE CAUSE
•  Blower relay, blower motor, resistor, fan switch malfunction
•  Blower unit malfunction

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.