Shop Cooling System by Category
Filters
74 products
Not sure it fits your truck?
Our Wildwood, FL techs will confirm the right part for your build before you buy.
Call or Text (352) 722-5295Cooling on the 2015-2016 Ford 6.7L Powerstroke
Ford describes the diesel cooling system as pressurized series flow, and on this Powerstroke it is really two systems. The primary, high-temp loop cools the block and heads, the oil cooler, the water-cooled turbo and the heater core. The secondary, low-temp loop cools the air-to-water charge-air cooler in the valley, the fuel cooler and the transmission cooler. For 2015, Ford moved both EGR-cooler coolant circuits onto the primary loop, which takes heat load off the secondary side. That change arrived with the second-generation 6.7L rated at 440 hp and 860 lb-ft, so a 2015-2016 truck is not plumbed exactly like a 2011-2014.
What fails and why
The documented weak points are plastic. The factory primary radiator has plastic end tanks crimped to the core, and diesel heat and pressure cycling wear on the tanks until the crimps let go. Signs: coolant seeping at the tank seams, a low primary degas level, a sweet smell, or overheating on a tow. The factory upper coolant pipe is plastic too, and it is prone to cracking and leaking with age. That one shows up as coolant on top of the engine and low-coolant warnings that keep coming back.
The other failure is service neglect. Ford's coolant interval is 105,000 miles or 6 years the first time, then every 45,000 miles or 36 months. Severe duty moves the first change up to 60,000 miles or 2,400 hours. Old coolant, or the wrong coolant mixed into either loop, leads to corrosion and clogged EGR cooler and charge-air cooler passages.
Stock replacement vs. upgrade
If your truck is a daily driver with light towing, OEM-style parts put it back the way Ford built it: Dorman hoses and recovery tank, Alliant Power and Mahle thermostats, CSF OEM-style radiators, and Dayco or Alliant Power water pumps. If you tow heavy through a Florida summer, or a plastic part has already let go once, an upgrade takes the plastic out: a Mishimoto all-aluminum primary radiator, the S&B aluminum upper coolant pipe, a Mishimoto aluminum degas tank, silicone hose kits or a Wehrli billet thermostat housing.
What we carry
- Mishimoto: aluminum primary and secondary radiators, expansion and degas tanks, silicone hose kits, thermostats, an upper support bar and Liquid Chill coolant.
- SPE Motorsport: a low-temp, high-flow thermostat and a factory-replacement degas hose kit.
- Dorman: radiator, reservoir, heater and EGR cooler hoses, the engine oil cooler and its lines, a thermostat housing and the coolant recovery tank.
- XDP: Xtra Cool primary and secondary water pumps, direct-fit main and secondary radiators, an ECT sensor, a reservoir cap and a coolant filtration system.
- Mahle, Alliant Power and Dayco: thermostats, water pumps, radiator hoses, crossover gaskets and seals.
- CSF OEM-style radiators, a No Limit Fabrication secondary coolant tank, Hot Shot's Secret coolant, the S&B upper coolant pipe, a Wehrli Custom Fabrication billet thermostat housing and Fleece Performance Engineering cooling parts.
Fitment notes
Two loops means two degas bottles, two thermostat sets and two water pumps, and primary and secondary parts don't swap. The secondary thermostats are handed: RT-1207 left, RT-1206 right, with RT-1231 as the primary. The degas cap on 2015-2016 trucks is Motorcraft RS-345, not the 2011-only RS-527. Aftermarket radiators are catalogued 2011-2016 as one range even though EGR-cooler plumbing changed for 2015, so confirm hose and quick-disconnect routing for your truck before you order. Ford changed many cooling part numbers at the 2017 redesign, so go by the year range on each listing, and verify by VIN when in doubt.
Frequently asked questions
Why does a 2015-2016 6.7L Powerstroke have two radiators?
Because it has two cooling loops. The primary radiator serves the engine, oil cooler, turbo, heater core and EGR cooler. The secondary radiator serves the charge-air cooler, fuel cooler and transmission cooler, which makes it the closest thing this engine has to an intercooler radiator.
What coolant does Ford put in this engine?
Motorcraft Orange VC-3-B concentrate mixed 50/50 with distilled water, in both loops. The primary loop holds about 7.25 to 7.75 gallons and the secondary about 2 gallons. Don't mix a different coolant into either loop.
When is the coolant due on a 2015-2016 Super Duty?
Ford's schedule is 105,000 miles or 6 years for the first change, then every 45,000 miles or 36 months. On severe duty the first change comes at 60,000 miles or 2,400 hours. Service both loops, not just the one you can see.
Is an aluminum radiator worth it on a 2015-2016?
The factory primary radiator's plastic tanks and crimps are its documented weak spot, and heat and pressure cycling are what wear them out. If yours is seeping or you tow often, an all-aluminum unit removes that weak spot. If the truck sees light duty, an OEM-style replacement from CSF or XDP is the simpler choice.
Not sure what fits? Call the shop at the number in the header, or use the fitment checker on any product page. We install everything we sell.