Windshield Fogged [Full-Auto Air Conditioner]: Notes

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.

WINDSHIELD FOGGED (FULL-AUTO AIR CONDITIONER) - DESCRIPTION & POSSIBLE CAUSE

DESCRIPTION

A/C compressor does not operate while airflow mode is in DEFROSTER or DEF/HEAT modes
Air intake mode does not change to FRESH while airflow mode is in DEFROSTER or DEF/HEAT modes

POSSIBLE CAUSE

A/C compressor malfunction
Blower unit malfunction
ROOM 15 A fuse malfunction
Open or short circuit in wiring harness between battery positive terminal and climate control unit
Open or short circuit in wiring harness between climate control unit and each actuator/sensor
Open or short circuit in wiring harness between climate control unit and air intake actuator position sensor
Climate control unit connector malfunction or poor connection
Air intake actuator connector malfunction or poor connection
Air intake actuator malfunction
Air intake link malfunction
Climate control unit malfunction
Air intake door malfunction

When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, inspect to make sure connectors, terminals and wiring harness are connected correctly and undamaged.
NOTE:
- The climate control unit controls the air intake mode when the airflow mode is in DEFROSTER so that it is fixed at FRESH mode. At this time, the airflow mode cannot be changed from FRESH to RECIRCULATE even if the REC switch is pressed, but this does not indicate a malfunction.