Diagnostic Procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

INSUFFICIENT AIR (OR NO AIR) BLOWN FROM VENTS (MANUAL AIR CONDITIONER) DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	INSPECT A/C UNIT AIRFLOW MODE SYSTEM Inspect the A/C unit and/or climate control unit airflow mode links, air airflow mode cranks, air airflow mode rods, and wire clamp. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER] .) Is there grease on links and cranks? Are links, cranks, and rods securely installed in their proper positions? Is wire clamp free of deformation? Are the above items normal?	Yes	Go to the next step.
1		No	Apply grease or install airflow mode links, cranks and rods securely in their proper positions, or repair or replace airflow mode wire clamp, then go to Step 9. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER] .)
2	INSPECT TO SEE WHETHER MALFUNCTION IS IN VENT MODE OR OTHER MODES Does air blow out when in the VENT mode?	Yes	Go to Step 5.
2		No	Go to the next step.
3	INSPECT VENT Is the vent clogged?	Yes	Remove obstruction, then go to Step 9.
3	INSPECT VENT Is the vent clogged?	No	Go to the next step.
4	VERIFY THAT DUCT IN DASHBOARD IS INSTALLED Is the duct in the dashboard properly installed? (See DASHBOARD REMOVAL .) (See DASHBOARD INSTALLATION .)	Yes	Inspect the duct for clogging, deformation and air leakage, then go to Step 9.
4		No	Install the incorrectly installed ducts properly, then go to Step 9. (See DASHBOARD DISASSEMBLY/ASSEMBLY .)
5	INSPECT TO SEE WHETHER MALFUNCTION IS IN HEAT MODE OR DEFROSTER MODE Does air blow out when in the HEAT mode?	Yes	Go to the next step.
5		No	Inspect the vent for clogging, then go to Step 9.
6	INSPECT DEFROSTER MODE Does air blow out when in the DEFROSTER mode?	Yes	Operation is normal. Recheck malfunction symptoms.
6		No	Go to the next step.
7	INSPECT VENT Is the vent clogged?	Yes	Remove obstruction, then go to Step 9.
7	INSPECT VENT Is the vent clogged?	No	Go to the next step.
8	VERIFY DUCT INSTALLATION CONDITION Are the following ducts installed properly? (See DASHBOARD REMOVAL .) (See DASHBOARD INSTALLATION .) Dashboard ducts Defroster ducts	Yes	Inspect ducts for restriction, deformity, and air leakage, then go to the next step.
8		No	Install the incorrectly installed ducts properly, then go to the next step. (See DASHBOARD DISASSEMBLY/ASSEMBLY .)
9	CONFIRM THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR Is air discharged from vent?	Yes	Troubleshooting completed. Explain repairs to customer.
9		No	Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.