
Diagnostic procedure

Dtc b2103
Dtc b2431Mazda 6 Service 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 Service Manual: Oil cooler disassembly/assembly
1. Disassemble in the order indicated in the table.
2. Assemble in the reverse order of disassembly.
Radiator Outer Tank (In Tank Oil Cooler) Removal Note
1. Inspect the height of the header tabs.
2. Insert the end of a medium tip screwdriver between the end of the header
tab and the out ...