Honda Pilot Transmission Oil Cooler 06224-5J4-010

This is the front-mounted automatic transmission fluid cooler for Honda's 3.5L J-series V6 platform, replacing OE part 06224-5J4-010 (also sold as 06224-5J4-000 / 062245J4010). It is the aluminum tube-and-fin core that sits ahead of the radiator and condenser and carries ATF out of the transaxle, sheds heat into oncoming air, and returns cooled fluid to the case.

Fitment covers Honda Pilot 2016-2022, Odyssey 2018-2025, Passport 2019-2025 and Ridgeline 2020-2024, plus Acura MDX 2016-2020 and TLX 2015-2020 on the same 3.5L powertrain. Confirm your engine is the 3.5L V6 and compare the OE number stamped on the old core before ordering, because Honda used more than one cooler size across this platform.

The two things that kill these coolers are road debris and corrosion. A stone through the grille opens a fin pass and you get a red puddle under the nose and a dropping fluid level; salt-belt corrosion does the same thing more slowly through the tube ends. The other failure is internal restriction after a transmission comes apart - debris from a burned clutch pack washes downstream and plugs the cooler passages, which starves the cooler circuit and cooks the rebuild you just paid for. Any time a unit is replaced or overhauled on one of these vehicles, the cooler either gets flow-tested and flushed or gets replaced. Replacing it is the cheap call.

On the bench side: pull the front fascia and upper radiator support for access, cap the transmission cooler lines to keep ATF off the ground, transfer the rubber isolators and brackets over to the new core, and use new O-rings or sealing washers on the line fittings. Refill with Honda ATF DW-1 (or HCF-2 where the transmission calls for it), then check the level hot with the engine at operating temperature per the service procedure - these transaxles are level-sensitive and an underfill shows up as a flare or a harsh shift.