6R80 Transmission Cooler 2015-2017

If you tow with a 2015-2017 Ford F-150 and watch the transmission temperature climb on every long grade, or you have found ATF dripping off the front of the truck from a cracked or punctured cooler, this is the part you are shopping for. It is a direct-fit, tube-and-fin aluminum transmission fluid cooler for the thirteenth-generation F-150 with the 6R80 six-speed automatic, supplied new with the mounting brackets and hardware shown in the photo. It bolts into the factory cooler position ahead of the radiator and connects to the original cooler lines.

What the transmission cooler does in a 6R80

The 6R80 makes most of its heat in the torque converter, especially when the converter is unlocked under load: pulling a trailer from a stop, crawling in traffic, or climbing a long hill in a low gear. Hot fluid leaves the case, runs forward through the cooler lines, gives up heat to the air passing through the cooler core, and returns to the transmission to lubricate the gear train. On the 2015-2017 F-150 the liquid-to-air cooler sits in the front of the truck with the rest of the cooling stack. A larger core with more tube and fin area moves more heat at the same airflow, which matters because everything inside this transmission depends on the fluid: the solenoid-controlled clutch apply timing, the converter clutch, and the bushings and planetary gears.

Mercon LV that runs hot for long periods oxidizes, loses its friction properties and leaves varnish in the valve body. That shows up later as the shift complaints the 6R80 is known for, and a cooler is one of the few parts that helps prevent them rather than repairing them after the fact.

Symptoms of a failing or undersized 6R80 cooler

• ATF on the radiator support, bumper cover or front skid area, or wet line fittings at the cooler tanks
• A core with crushed fins, a rock strike or corrosion that blocks airflow
• Transmission temperature rising quickly when towing or plowing, then slow to come down
• Dark, burnt-smelling fluid at a service interval that should still look clean
• Torque converter shudder on light throttle after the truck has been worked hard
• Debris left in the cooler after an internal failure, which must be cleared or the core replaced before a rebuilt unit or new valve body goes in

How to confirm the cooler is the problem

Put the truck on level ground and look before you buy. Wipe the cooler tanks and both line connections, run the engine, and check again for fresh fluid. Inspect the core face with a light; bent fins can often be straightened, but a leaking tube cannot be repaired. Then check fluid level the Ford way: the 6R80 has no dipstick, so the level is set at the check plug in the pan with the engine running and the fluid at operating temperature. Not every hard shift on these trucks is heat related. The 2015-2017 F-150 is covered by a lead frame and range sensor recall for an unexpected downshift, so read our 6R80 F-150 common problems guide and the F-150 shift problems diagnosis before you assume the cooler is the cause.

Fitment

This listing fits the 6R80 in the 2015-2017 Ford F-150. The cooler is shaped for the F-150 front-end cooler location and is designed for trucks that left the factory with the liquid-to-air transmission cooler; trucks built without it may need extra hose to tie into the cooling circuit. It is not a fit for the Expedition, Navigator or Mustang, which mount their coolers differently even though they share the 6R80. The 2017 F-150 3.5L EcoBoost moved to the 10R80, so 2017 owners should read the transmission tag on the case or send us the year and VIN so we can confirm before it ships. Every other 6R80 part we carry is on the 6R80 parts page.

Install notes

• Set a drain pan under the front of the truck; the lines and the old core hold fluid.
• Release the quick-connect fittings at the cooler, unbolt the old cooler and work it out through the front of the stack.
• Mount the new core with the supplied brackets so it clears the radiator and the grille shutters, then push the lines on until they lock and tug-test each one.
• The new core holds a little more fluid than the factory one. Top off with Motorcraft Mercon LV only, then set the level at the check plug hot with the engine running.
• If you are replacing the cooler after an internal failure, do it alongside the repair: a 6R80 lead frame kit with filter or a valve body is wasted if old debris washes back in from the lines.

Will this cooler fit my 2015-2017 F-150 with the 5.0L V8 or the 2.7L EcoBoost?

It is built for the 2015-2017 F-150 front cooler position with V6 and V8 engines. The main requirement is that the truck has the factory liquid-to-air transmission cooler. Send the year and VIN if you are unsure, especially on a 2017 3.5L EcoBoost, which may have the 10R80 instead of the 6R80.

Do I need new cooler lines?

No. It reuses the factory lines and quick-connect fittings. Replace a line only if it is leaking, kinked or contaminated from a failed transmission.

What fluid goes in after the install?

Motorcraft Mercon LV, the same fluid the 6R80 uses everywhere else. Ford warns against adding supplements. Top off after the cooler is filled and set the final level hot at the check plug.

Does a bigger cooler fix a 6R80 that already shifts hard?

No. A cooler protects the fluid and slows future wear. Harsh or erratic shifts on these trucks usually come from the lead frame, solenoids or valve body, so diagnose those first and add the cooler as part of the repair.

Is a relearn needed after replacing the cooler?

Not for the cooler alone. If you also replace a lead frame, solenoids or valve body, the PCM needs the new solenoid data and an adaptive relearn drive.

• 6R80 F150 Common Problems and Fixes
• 6R80 F150 Shift Problems: Diagnosis and Fix
• 6R80 Common Problems and Fixes