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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 (Step 1) • Blower unit malfunction (Steps 2-4)

Diagnostic procedure

Step | Inspection | Inspection item (s)
--- | --- | ---
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.