Dodge Cummins Radiator

Why Does Your Cummins Need a Radiator Cooling Upgrade?

The factory Dodge Ram cooling system was engineered for a stock truck at stock power, and it starts giving up the moment you add a tune, a load, or a few hundred thousand miles. Here are the three failures we see most in the shop.

Cracked Plastic Tanks And A Split Coolant Y-Pipe

Dodge crimps the aluminum radiator tubes into plastic end tanks and, on the 2013 and newer 6.7L Rams with the dual radiator setup, joins the two halves with a molded plastic Y-pipe. Heat cycles, vibration, and glycol pressure make that plastic brittle until it cracks at the crimp or splits at the Y. The truck dumps coolant fast and the driver does not always catch it before the temp gauge spikes. A weldless 6061-T6 billet aluminum Y-pipe and aluminum-tank cooling parts remove the plastic failure point entirely.

Hose Blowout And Weeping Spring Clamps

The OE rubber radiator hoses swell under sustained heat and pressure, the factory spring clamps lose tension, and the next hard pull under load blows a hose off the nipple. A multi-layer reinforced silicone radiator hose kit with high-torque 304 stainless T-bolt clamps holds its seal at temperature where rubber lets go, and it resists the ozone and oil mist that turn rubber hoses soft.

Lazy Fan Clutch And Creeping Coolant Temperature

The factory thermal fan clutch wears out, locks up late, or never fully engages, so the fan stops pulling enough air through the radiator at idle and low speed. Coolant temp climbs, oil temp follows, and on a 5.9L or 6.7L Cummins that path leads straight toward head gasket trouble. A heavy-duty fan clutch engages on demand and moves the air the worn OE unit stopped moving.

What Can a Cummins Radiator Upgrade Solve?

The Coolant Y-Pipe: Kill The Plastic Junction For Good

On the 2013 to 2020 dual radiator 6.7L Rams, our weldless CNC billet aluminum Y-pipe replaces the factory plastic Y with one solid, TIG-finished piece that will not crack, weep, or split under heat and pressure. It restores full, unrestricted flow to both radiator halves and stops the slow coolant loss that strands these trucks.

The Silicone Hose Kit: Hold Pressure At Temperature

Our reinforced silicone radiator coolant hose kit for the 2003 to 2010 5.9L and 6.7L Rams is built from multi-layer high-temperature silicone over a tough reinforcing ply, paired with stainless clamps that actually hold torque. It stops the swelling, ballooning, and blowout that takes out stock rubber hoses on tuned and worked trucks.

The Fan Clutch: Move Air On Demand

Our heavy-duty engine radiator cooling fan clutch for the 2004 to 2009 5.9L and 6.7L Rams engages firmly when coolant temperature rises, pulling the volume of air the worn factory clutch stopped pulling. The result is lower coolant temperature, lower oil temperature, and a wider safety margin before the head gasket is at risk.

Shop Cummins Radiator by Dodge Engine & Fitment Guide

• 4th Gen 6.7L Cummins (2013-2020) - The split dual radiator Rams.
  Weldless Dual Radiator Coolant Y-Pipe - Fits the 6.7L Cummins in the Dodge Ram 2500 and 3500 (2013-2020). Replaces the failure-prone factory plastic Y with a single weldless 6061-T6 billet aluminum piece for leak-free flow to both radiator halves.
• 4th Gen 6.7L Cummins (2013-2014) - Early split radiator Rams.
  Dual Radiator Coolant Y-Pipe - Fits the 6.7L Cummins in the Dodge Ram 2500 and 3500 (2013-2014). A direct-fit upgraded Y-pipe for the first years of the dual radiator design that stops the crack at the plastic junction.
• 3rd Gen 5.9L & 6.7L Cummins (2003-2010) - The single radiator Rams.
  Silicone Radiator Coolant Hose Kit - Fits the 5.9L and 6.7L Cummins in the Dodge Ram 2500 and 3500 (2003-2010). Multi-layer reinforced high-temperature silicone with stainless clamps that hold pressure where factory rubber blows out.
• 3rd Gen 5.9L & 6.7L Cummins (2004-2009) - The single radiator Rams.
  Engine Radiator Cooling Fan Clutch - Fits the 5.9L and 6.7L Cummins in the Dodge Ram 2500 (2004-2009). A heavy-duty thermal fan clutch that locks up on demand to pull air and pull down coolant and oil temperature.

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Which years and engines does this Cummins radiator cooling collection cover?

This collection covers the Dodge Ram 2500 and 3500 Cummins from the 2003 model year through 2020. The parts are split across the 5.9L and 6.7L engines, with the silicone hose kit and fan clutch fitting the 2003 to 2010 5.9L and 6.7L Rams and the dual radiator Y-pipes fitting the 2013 to 2020 6.7L Rams. Every listing states the exact engine, model, and year range it fits, so match your truck to the listing before you order.
If you run a 1989 to 2002 first or second generation truck, the radiator and coolant routing are different, and these specific parts will not be a direct drop-in for that generation.

What does the dual radiator coolant Y-pipe do on a 2013-2020 6.7L Cummins?

The 2013 and newer 6.7L Rams use a split dual radiator design, and the coolant Y-pipe is the junction that routes coolant into and out of both radiator halves. From the factory that junction is a molded plastic piece that cracks, weeps, and eventually splits under heat and pressure.
Our weldless 6061-T6 billet aluminum Y-pipe replaces that plastic junction with one solid, precision-machined piece that will not crack and restores full unrestricted flow to both radiator cores. It is a direct-fit replacement, no drilling or rigging required.

Why does my 6.7 Cummins have two radiators?

Dodge split the radiator into two cores on the 2013 and up 6.7L Rams to increase total cooling surface area and airflow for the higher-output 6.7 and the heavier emissions heat load. The two halves sit side by side and share coolant through the central Y-pipe junction.
More cooling capacity is good for towing and hot tuning, but it also means that single plastic Y-pipe becomes a critical failure point. Upgrading the Y to a weldless aluminum piece protects the whole dual radiator setup.

How do I know my Cummins radiator Y-pipe or plastic tank is failing?

The classic signs are unexplained coolant loss with no obvious puddle, dried pink or green coolant crust around the radiator crimps or the center Y junction, and a sweet coolant smell after a hard pull. You may also see the coolant level drop slowly over a few days even though the truck is not overheating yet.
Left alone, a cracked plastic tank or split Y-pipe will let go suddenly under load and dump coolant fast. If you see crust at the crimps or the Y, replace it before the truck leaves you on the shoulder.

What does oil in my radiator mean on a 5.9 Cummins?

Oil in the coolant or radiator on a 5.9L Cummins usually points to a failed engine oil cooler, and on a higher-mileage or overheated truck it can also indicate a worn head gasket letting oil and coolant mix. You will see a thick milky sludge under the radiator cap and in the coolant bottle.
This is a root-cause problem, not a radiator part to swap, so diagnose the oil cooler and head gasket first. Once the cause is fixed, flush the cooling system thoroughly, then our silicone hoses and upgraded cooling parts help the fresh coolant stay clean and pressure-tight.

Where is the coolant drain plug on a 5.9 or 6.7 Cummins radiator?

On the Dodge Ram Cummins radiator the drain, often called the petcock, is located at the bottom corner of the radiator tank, usually on the passenger side down low. There is also a block drain plug on the side of the 5.9L and 6.7L block for draining the engine itself.
Open the radiator petcock slowly with a catch pan ready, and never remove a cap or drain on a hot system. If the petcock is brittle or weeping, that is another reason the factory plastic radiator is living on borrowed time.

Are these silicone radiator hoses really better than factory rubber?

Yes. Our radiator coolant hose kits are built from multi-layer high-temperature silicone over a reinforcing ply, and they hold coolant pressure at temperature where factory EPDM rubber swells and gets soft. They resist ozone, heat, and oil mist far better than rubber, which means they keep their shape and their seal for far more miles.
Paired with high-torque stainless clamps, a silicone kit removes the hose blowout and weeping clamp failures that strand worked and tuned trucks. They are a true upgrade over stock rubber on a 5.9L or 6.7L Cummins.

When should I replace my Dodge Ram Cummins fan clutch?

Replace the fan clutch when you notice the temperature climbing at idle or low speed with no airflow noise from the fan, when the fan roars constantly and never freewheels, or when the clutch hub has visible fluid leakage or excessive wobble. A lazy fan clutch lets coolant and oil temperature run hot together.
Our heavy-duty thermal fan clutch engages firmly on demand for the 2004 to 2009 5.9L and 6.7L Rams, pulling the air the worn factory unit stopped moving and buying you margin before head gasket territory.

Will these cooling parts fit my 12-valve or 24-valve 5.9 Cummins?

The Y-pipes, hose kits, and fan clutch in this collection are engineered for the 2003 and newer third generation 5.9L 24-valve and the 6.7L Rams. The 1989 to 1998 first and second generation 12-valve trucks and the 1998 to 2002 second generation 24-valve trucks use a different radiator, hose routing, and fan setup.
So a true 12-valve or early 24-valve 5.9 from those generations will not be a direct fit for these specific listings. Confirm your exact year and configuration against each listing, or contact our tech line for the correct parts for an older 12-valve build.

Is upgrading my Cummins radiator legal for street use, and does fitment matter?

These radiator cooling parts are direct-fit replacement and upgrade cooling components, not emissions modifications, so they are legal for street use in most areas. If your truck has been emissions-deleted, built for competition, or run on a closed-course or off-road only basis, federal, state, and local emissions and equipment laws may still apply, so check your jurisdiction before installation.
Fitment matters a great deal, because the 5.9L and 6.7L Rams changed radiator and coolant routing across the 2003 to 2020 generations, so always match your exact year and engine to the listing. Every order ships free, is covered by our 1-year warranty, and is backed by our 45-day return policy so you can order with confidence.