No Temperature Control With Climate Control Unit [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.

NO TEMPERATURE CONTROL WITH CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER) - DESCRIPTION & POSSIBLE CAUSE

DESCRIPTION

Temperature does not change when operating temperature control dial
Malfunction in A/C unit and/or climate control unit air mix system
Malfunction in driver and/or passenger side air mix actuator or related wiring harness

POSSIBLE CAUSE

ROOM 15 A fuse malfunction
Open or short circuit in wiring harness between fuse block 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 mix actuator position sensor
Climate control unit connector malfunction or poor connection
Air mix actuator connector malfunction or poor connection
Air mix actuator malfunction
Air mix link malfunction
Air mix door malfunction
Climate control unit malfunction
Heater hose malfunction

When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while performing 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 harnesses are connected correctly and undamaged.