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.

INSUFFICIENT AIR (OR NO AIR) BLOWN FROM VENTS - DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	INSPECT AIRFLOW MODE CONTROL SYSTEM, STARTING FROM CLIMATE CONTROL UNIT When airflow mode control dial is operated, is appropriate resistance felt and can it be moved to its full range?	Yes	Go to next step.
1		No	Go to Step 1 of troubleshooting index No.3.
2	CHECK TO SEE IF MALFUNCTION IS IN VENT MODE OR OTHER MODES Is air discharged when in VENT mode?	Yes	Go to Step 5.
2		No	Go to next step.
3	INSPECT VENT Is vent clogged?	Yes	Remove obstruction, then go to Step 9.
3	INSPECT VENT Is vent clogged?	No	Go to next step.
4	VERIFY THAT DUCT IN DASHBOARD IS INSTALLED Is duct in dashboard properly installed?	Yes	Check duct for clogging, deformity and air leakage, then go to Step 9.
4		No	Install duct securely in the proper position, then go to Step 9.
5	CHECK TO SEE IF MALFUNCTION IS IN HEAT MODE OR DEFROSTER MODE Is air discharged when in HEAT mode?	Yes	Go to next step.
5		No	Check vent for clogging, then go to Step 9.
6	INSPECT DEFROSTER MODE Is air discharged when in DEFROSTER mode?	Yes	Operation is okay. Recheck malfunction symptoms.
6		No	Go to next step.
7	INSPECT VENT Is vent clogged?	Yes	Remove obstruction, then go to Step 9.
7	INSPECT VENT Is vent clogged?	No	Go to next step.
8	VERIFY THAT DEFROSTER DUCT IS INSTALLED Is defroster duct properly installed?	Yes	Check duct for clogging, deformity, and air leakage, then go to next step.
8		No	Install duct securely in the proper position, then go to next step.
9	VERIFY THAT MALFUNCTION SYMPTOM DOES NOT OCCUR AFTER REPAIR Is air discharged?	Yes	Troubleshooting completed. Explain repairs to customer.
9		No	Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.