Oil Cooler

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.

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Remove the front under cover No. 2. (See FRONT UNDER COVER No. 2 REMOVAL/INSTALLATION .)
Drain the ATF. (See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT .)
Disconnect the wiring harness from the front crossmember. (Vehicle with i-ELOOP)

Fig 1: Wiring Harness Clip And Front Crossmember
Courtesy of MAZDA MOTORS CORP.
Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT .)
Remove in the order indicated in the table.
Install in the reverse order of removal.
Add the engine coolant. (See ENGINE COOLANT REPLACEMENT .)
Add the ATF. (See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT .)
Perform the "Mechanical System Test". (See MECHANICAL SYSTEM TEST .)

Fig 2: Removing Water-Cooled Oil Cooler

Courtesy of MAZDA MOTORS CORP.

COMPONENT DESCRIPTION

1	Water hose No. 1 (See Water Hose No. 1 and No. 2 (oil cooler side) Installation Note .)
2	Water hose No. 2 (See Water Hose No. 1 and No. 2 (oil cooler side) Installation Note .)
3	Water-cooled oil cooler Type A: cylindrical oil cooler Type B: cubic-shaped oil cooler
4	0-rings