Ford F-150 6R80 Transmission Oil Cooler FL3Z-7A095-B

Owners of a 2015-2017 Ford F-150 with the 5.0L V8 and 6R80 six-speed usually find this part after one of two discoveries: ATF or coolant seeping around the cooler on the engine side of the transmission, or pink, milky fluid at the transmission check plug. This is the AISIN OICFD-00005 transmission oil cooler, a direct replacement for Ford part FL3Z-7A095-B. It is a two-row aluminum plate cooler with 14 mm threaded inlet and outlet connections, and the gasket and seal rings come in the box.

What this cooler does in a 6R80 F-150

Unlike a radiator-tank or front-mounted air cooler, this is a water-cooled heat exchanger. Engine coolant flows through one set of passages and ATF through the other, separated by thin aluminum plates. On a cold morning the coolant warms the 6R80 fluid faster, which matters because the unit's shift quality and converter clutch apply depend on fluid temperature. Once the truck is working or towing, the same plates pull heat out of the ATF and hand it to the cooling system. That dual job is also its weakness: a crack in one plate lets coolant and transmission fluid mix.

Symptoms of a failing cooler

• ATF or coolant wetness around the cooler body or its seals
• Engine coolant level that keeps dropping with no external radiator leak
• Pink, milky or foamy fluid on the 6R80 check plug or in the pan
• Slipping or shudder that appears after a coolant loss, because glycol attacks clutch friction material
• ATF traces in the coolant reservoir

How to confirm before buying

Not every wet spot on a 6R80 is the cooler. The case connector, the pan gasket and the vent are common leak points on this transmission, and our 6R80 fluid leak guide walks through each one. Clean the area, run the truck to temperature and look again to see which seam is weeping. If the problem is the electrical bulkhead connector rather than the cooler, the fix is a 6R80 lead frame connector and valve body seal. Cross-contamination is easier to confirm: milky ATF plus a falling coolant level points squarely at an internal cooler failure, and the truck should not be driven until it is replaced.

Fitment

This cooler fits the 2015-2017 Ford F-150 with the 5.0L V8. On 2017 trucks it fits only those built with the 6-speed 6R80, not the 10-speed 10R80 that Ford phased in that year, so confirm the transmission code on the door jamb label or count gears on a scan tool. EcoBoost and V6 trucks, and F-150s from 2014 and earlier, use different cooler arrangements. Match the old part to FL3Z-7A095-B before ordering, or send us your year and VIN and we will check it. Other parts for this transmission are in our 6R80 parts collection.

Install notes

• Let the engine cool, then drain coolant below the level of the cooler before opening anything.
• Disconnect the coolant hoses and the ATF fittings, cap the transmission lines, and remove the old cooler.
• Clean the mounting face completely; old gasket material left behind is the most common cause of a comeback leak. Fit the new gasket and seal rings and tighten the fasteners evenly.
• Refill and bleed the cooling system so no air pocket sits in the cooler.
• Top up the transmission with MERCON LV and set the level hot through the check plug, per Ford's procedure. A small loss is covered by a quart or two; if coolant got into the ATF, plan on a full flush with a 12-quart case of Motorcraft MERCON LV and recheck the fluid after a short drive.
• Our 6R80 F-150 fluid change guide covers the fill and hot level check step by step.

Will this cooler fit my 2017 F-150?

Only if it is a 5.0L V8 truck built with the 6-speed 6R80. 2017 F-150s with the 10-speed 10R80 use a different cooler. Check the transmission code on the door jamb label or send us the VIN.

Does it fit the 2.7L or 3.5L EcoBoost?

This listing is for the 2015-2017 5.0L V8 application that uses Ford FL3Z-7A095-B. Match your old part number before ordering if you have a different engine.

What happens if I keep driving with coolant in the transmission fluid?

Glycol degrades clutch friction material and the 6R80 will begin to slip or shudder. The longer it runs contaminated, the more likely the clutches need replacement, so replace the cooler and flush the transmission promptly.

What fluid do I need after replacing the cooler?

The 6R80 takes Ford MERCON LV. Expect to top off at least a quart or two after the swap. If the ATF was contaminated with coolant, do a full flush, which can use most of a 12-quart case.

Does it come with seals?

Yes. The gasket and sealing rings are included. Clean the mounting surface well before fitting them.

• 6R80 Fluid Leak: Common Spots and Fixes
• 6R80 F150 Fluid Change: Type, Capacity and Cost
• 6R80 Common Problems and Fixes
• 6R80 Fluid Type and Capacity