Oil Cooler Removal/Installation [FS5 A EL]
1. Remove the battery cover..
2. Disconnect the negative battery cable.
3. Remove the air cleaner component..
4. Remove the aerodynamic under cover NO.2..
5. Drain the ATF..
6. Drain the engine coolant..
7. Remove in the order indicated in the table.

Water hose (connected to the outlet)
Water hose (connected to the thermostat)
Oil hose
(See Oil Hose Installation Note.)
Hose clamp
(See Oil Hose Installation Note.)
Connector bolt
Packing
Oil cooler
8. Install in the reverse order of removal.
9. Add the engine coolant..
10. Add the ATF..
11. Perform the “Mechanical System Test”..
Oil Hose Installation Note1. Install the oil hose.
- Oil cooler side
Install the oil hose into the oil cooler to the position shown in the figure.

- Connector bolt side
Install the oil hose into the connector bolt to the position shown in the figure.

2. Install the hose clamp within the marked area of the oil hose.

NOTE:
If the oil hose is to be re-used, install the hose clamp to the impression in the hose left by the previous installation. After installation, apply force to the hose clamp in the direction of the arrows to engage the hose clamp securely.

3. Verify that the hose clamp does not interfere with any other components.
Test yourself
A quick Mazda 3 quiz: every answer comes with an explanation and a link to the manual page.