Discuss the matter with an Authorized Mazda Dealer. This is the quickest and best way to address the issue.
Customer Assistance (U.S.A.)
STEP 2: Contact Mazda North American OperationsMazda 6 Owners Manual: Rear door speaker inspection
1. Inspect for resistance between the rear door speaker terminals using an
ohmmeter.
If not as specified, replace the rear door speaker.
2. To verify that the rear door speaker outputs sound, apply voltage to the
rear door speaker and release using a 1.5-V battery.
If not outputs ...
Mazda 6 Owners Manual: Refrigerant lines removal/installation
1. Remove the battery.
2. Discharge the refrigerant from the system. (See RECOVERY.) (See CHARGING.)
3. Remove the washer tank. (L.H.D. only) (See WASHER TANK
REMOVAL/INSTALLATION.)
4. Remove the air cleaner cover, air cleaner element and air cleaner case.
(See INTAKE-AIR SYSTEM
REMOVAL/INST ...