Discuss the matter with an Authorized Mazda Dealer. This is the quickest and best way to address the issue.
Mazda 6 Owners Manual: Heater core inspection
1. Remove the A/C unit. (See A/C UNIT REMOVAL/INSTALLATION.)
2. Remove the heater core from the A/C unit.
3. Inspect for cracks, damage, and coolant leakage.
If any problems are found, replace the heater core.
4. Inspect for bent fins.
If any are bent, use a flathead screwdriver to stra ...
Mazda 6 Owners Manual: Information display removal/installation
1. Disconnect the negative battery cable.
2. Remove the center panel module. (See CENTER PANEL MODULE
REMOVAL/INSTALLATION.)
3. Remove the LCD unit. (with car-navigation system) (See LCD UNIT
REMOVAL/INSTALLATION.)
4. Remove the center box. (without car-navigation system)
5. Remove in the or ...