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Call or Text (352) 722-5295Cooling system on the 2010-2018 RAM 6.7L Cummins
The 6.7L Cummins runs a belt-driven water pump, a 16 psi cap and about 29.5 quarts of coolant, roughly 5.7 gallons. The block and head are cast iron and the radiator core is aluminum, a metal mix that suits a HOAT-type coolant in the Zerex G-05 class. Ram filled these trucks with Mopar 10-year/150,000-mile antifreeze mixed 50/50 with distilled water. The radiator shares the front-end airflow with the air-to-air intercooler, so on a heavy-tow truck the two are worth thinking about together. When Ram overhauled the 2500 and 3500 for 2013 with a new frame, steering and brakes, an improved cooling system was on the list too, and you will see most parts here listed separately for 2010-2012 and 2013-2018 trucks.
What fails and why
- The 2013-2017 water pump recall. Recall 17V-562 covered about 494,000 Ram 2500, 3500 and chassis cab trucks, roughly 400,000 of them in the US, built with Concentric-brand pumps that lacked a vent hole. Coolant could get past the bearing and start an engine-compartment fire; FCA said the fires stayed localized to the pump area. Watch for a coolant weep at the pump, a squeal or warning lights. Some 2016 owners report failures on VINs the recall lookup did not flag, so look at the pump itself, not just the lookup.
- Water pumps wear out anyway. One shop's account puts two pump replacements over 185,000 miles in the normal range for a Cummins, roughly one every 90,000 miles in that case, and says aggressive flush chemicals shorten pump life. The signs are a drip from the weep hole or a growling bearing.
- Fan shroud and hoses under tow. Owners of 2014-2017 trucks report the fan shroud pulling into the radiator while towing, and overheating with a ruptured hose. These are scattered owner reports, but they are worth a look on any truck that runs hot with a trailer behind it.
- A weak cap. A cap that holds 5-6 psi instead of 16 cuts the boil-over margin and can mimic other faults.
- Head gasket warning signs. A head gasket starting to lift shows up in the cooling system first: an upper hose that is stiff and pressurized on a cold engine, overheating that acts like an air pocket, and coolant pushed out of the degas bottle. That pattern turns up at 100,000-200,000 miles on trucks that tow hard or have been tuned.
Stock replacement vs. upgrade
If the truck has never run hot and you are fixing a leak or a worn part, stay with OEM-grade replacement: a genuine Cummins water pump or thermostat, a Dayco or Alliant Power pump, Dorman and Dayco hoses, a CSF OEM-style or XDP direct-fit radiator. If you tow heavy, or you have already chased overheating once, the upgrade parts make sense: a Mishimoto aluminum performance radiator, Mishimoto silicone hose kits, an aluminum degas tank or a WCFab tank kit, and Fleece coolant bypass parts. Fleece's bypass kits add an auxiliary-port thermostat housing and a bypass hose to improve coolant flow to the rear cylinders. It is an engine-cooling upgrade that leaves the emissions equipment alone.
What we carry
- Water pumps: Dayco, Alliant Power and genuine Cummins pumps, plus the XDP XD681 Xtra Cool pump for 2013-2018 and XDP bolt kits for the pump and thermostat housing.
- Radiators: CSF OEM-style, XDP Xtra Cool direct-fit, and Mishimoto replacement and aluminum performance radiators, with CSF and XDP secondary radiators for 2013-2015 trucks that have one.
- Hoses and connectors: Dayco curved radiator hoses and molded heater hoses, Dorman hose assemblies and heater hose connectors, Mishimoto silicone hose kits and Y-pipes, and the S&B heater core supply hose and dual-radiator Y-pipe.
- Thermostats, housings and gaskets: the Cummins 5627589 thermostat, Mishimoto high- and low-temperature thermostats, Dorman thermostat housings, and Mahle gaskets and water pump seals.
- Tanks and caps: Fleece and Dorman replacement tanks, the Mishimoto aluminum degas tank, and WCFab OEM-placement tank kits, a billet aluminum cap and a low-coolant sensor.
- Sensors and fan: XDP and Alliant Power temperature sensors and the Dorman 622-012 fan clutch for 2013-2018.
- Coolant: Mishimoto Liquid Chill coolants and additive, and extended-life and long-life coolants from Hot Shot's Secret.
Fitment notes
Most parts on this engine split at 2013. The XDP radiators are a good example: XD293 for 2010-2012 and XD294 for 2013-2018. The Dorman coolant reservoirs split the same way (603-778 and 603-839), and so do most of the Dayco hoses, with some upper hoses narrowed to 2013-2014. On 2013-2018 water pumps, Alliant Power lists one pump with an 88 mm pulley and one with an 82 mm pulley, so match the pulley on the pump you are replacing. Coolant service is split too: 2007.5-2012 trucks run a 97,500-mile/60-month interval and 2013-2018 trucks run 150,000 miles/120 months, so check the owner's manual before mixing coolants. Fleece's bypass kits come in separate 2010-2012 and 2013-2018 versions. Ram 3500, 4500 and 5500 chassis cabs share the engine but use different frames, filters and exhaust routing, so verify chassis-cab fitment separately, and confirm every part by VIN.
Frequently asked questions
How do I know if my water pump is part of the 17V-562 recall?
The recall covers 2013-2017 Ram 2500, 3500 and chassis cab trucks with Concentric-brand pumps built without a vent hole, and the remedy was a new pump. Run your VIN through the recall lookup. Some 2016 owners report pump failures on trucks the lookup did not flag, so if you see coolant weeping at the pump, treat it as a failing pump either way.
How often does the coolant need to be changed?
Ram's interval is 97,500 miles or 60 months on 2007.5-2012 trucks and 150,000 miles or 120 months on 2013-2018 trucks. The factory fill is Mopar 10-year/150,000-mile antifreeze mixed 50/50 with distilled water. Flush gently, because aggressive flush chemicals shorten water pump life.
My 6.7L runs hot when I tow. Where do I start?
Pressure-test the cap first, because a cap holding 5-6 psi instead of 16 drops the boil-over margin. Then look at the fan shroud and hoses, since 2014-2017 owners report the shroud pulling into the radiator under tow and ruptured hoses. If the upper hose is hard and pressurized on a cold engine, or the degas bottle is pushing coolant out, have the head gasket checked.
Is a coolant bypass kit worth it?
On a truck that works hard, it is a reasonable upgrade. Fleece's kits add an auxiliary-port thermostat housing and a bypass hose to improve coolant flow to the rear cylinders, and they leave the emissions equipment alone. Order the version for your year range, 2010-2012 or 2013-2018.
Should I go with a stock-style water pump or the XDP Xtra Cool?
For most trucks a stock-style pump from Dayco, Alliant Power or genuine Cummins is the direct answer. XDP's XD681 Xtra Cool pump is listed for 2013-2018 trucks. Whichever you pick, match the year range and the pulley size, and look over the pump bolts and seal while it is apart.
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.