Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE - 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 okay?	Yes	Go to next step.
1		No	Repair or replace malfunctioning part, then go to Step 5.
2	CHECK TO SEE IF 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.
2		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 okay?	Yes	Go to next step.
3		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.
4		No	Check if there are any obstructions in passage between blower unit and heater unit, then go to next step.
5	VERIFY THAT MALFUNCTION SYMPTOM DOES NOT OCCUR AFTER REPAIR Is air discharged?	Yes	Troubleshooting completed. Explain repairs to customer.
5		No	Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.