OVER 20 YEARS IN BUSINESS

UNMATCHED CUSTOMER SERVICE

Your cart

Your cart is empty

5.9L / 6.7L Diesel Cooling Upgrades

Cooling Upgrades for 5.9L and 6.7L Diesel Engines The 5.9L Magnum V8 and 6.7L Cummins inline-6 are legendary diesel powerplants known for their torque, durability, and towing capability. Both engines benefit greatly from enhanced cooling solutions that help manage heat during heavy-duty use and extended towing sessions. Proper cooling upgrades ensure your diesel engine maintains optimal operating temperatures, reducing wear and improving reliability under load. In this collection, you’ll find cooling components designed specifically for these diesel platforms, including high-capacity radiators, upgraded fans, thermostats, and auxiliary cooling parts. These upgrades support better heat dissipation, helping your engine run cooler and perform more consistently during demanding tasks. Key benefits of diesel cooling upgrades: - Improved heat management for heavy towing - Enhanced engine reliability and longevity - Optimized coolant flow and temperature control - Support for high-torque diesel applications Shop 5.9L and 6.7L diesel cooling upgrades at FastHemis.
SELECT YOUR VEHICLE

65 Results

HPS Silicone Radiator Hoses Kit: Dodge Ram 2500 & 3500 6.7L Diesel 2010 - 2012
HPS Silicone Radiator Hoses Kit: Dodge Ram 2500 & 3500 6.7L Diesel 2010 - 2012

HPS Silicone Radiator Hoses Kit: Dodge Ram 2500 & 3500 6.7L Diesel 2010 - 2012

HPS

Regular price $278.30 $242.00 13% off

Unit price
per 

3 colors
  • Red
  • Blue
  • Black
Mishimoto Replacement Radiator: Ram 2500 / Ram 3500 2013-2018
Mishimoto Replacement Radiator: Ram 2500 / Ram 3500 2013-2018

Mishimoto Replacement Radiator Ram 2500 / 3500 2013-2018 6.7L Diesel

Mishimoto

Regular price $326.00 $295.95 9% off

Unit price
per 

Mishimoto Performance Aluminum Radiator: Ram 2500 / Ram 3500 2019-2024
Mishimoto Performance Aluminum Radiator: Ram 2500 / Ram 3500 2019-2024

Mishimoto Perf Aluminum Radiator: Ram 2500/3500 2019-2024 6.7L Cummins Diesel

Mishimoto

Regular price $1,155.00 $1,049.95 9% off

Unit price
per 

Mishimoto Transmission Cooler Thicker Core (FRONT): RAM 2500/3500 2019-2023 6.7L Cummins
Mishimoto Transmission Cooler Thicker Core (FRONT): RAM 2500/3500 2019-2023 6.7L Cummins

Mishimoto Transmission Cooler: Ram 2500/3500 2019-2024 6.7L Diesel/6.4L 392

Mishimoto

Regular price $583.00 $529.95 9% off

Unit price
per 

Mishimoto Thermal Bypass: Ram 2500 / Ram 3500 2019-2024
Mishimoto Thermal Bypass: Ram 2500 / Ram 3500 2019-2024

Mishimoto Thermal Bypass Valve: Ram 2500 / 3500 2019-2026 6.7L Diesel

Mishimoto

Regular price $225.00 $204.95 9% off

Unit price
per 

Mishimoto Silicone Radiator Hose Kit Red (F&R): Dodge / RAM 2500/3500 2010-2012 6.7L Cummins
Mishimoto Silicone Radiator Hose Kit Red (F&R): Dodge / RAM 2500/3500 2010-2012 6.7L Cummins

Mishimoto Silicone Coolant Hose Kit Red: Dodge Ram 2500 6.7L Diesel 2010

Mishimoto

Regular price $271.00 $245.95 9% off

Unit price
per 

Mishimoto Silicone Radiator Hose Kit Blue (F&R): Dodge / RAM 2500/3500 2010-2012 6.7L Cummins
Mishimoto Silicone Radiator Hose Kit Blue (F&R): Dodge / RAM 2500/3500 2010-2012 6.7L Cummins

Mishimoto Blue Silicone Radiator Hose Kit w/ Internal Spring: Dodge Ram 2500 2010 6.7L Diesel

Mishimoto

Regular price $271.00 $245.95 9% off

Unit price
per 

Mishimoto Transmission Cooler Tube-Fin Core (F&R): Dodge Ram 2500/3500 1994-2002 5.9L Cummins
Mishimoto Transmission Cooler Tube-Fin Core (F&R): Dodge Ram 2500/3500 1994-2002 5.9L Cummins

Mishimoto Transmission Cooler Tube-Fin: Dodge Ram 2500 / 3500 1994-2002 5.9L Diesel

Mishimoto

Regular price $385.00 $349.95 9% off

Unit price
per 

Mishimoto Aluminum Radiator: Dodge Ram 2500 / Ram 3500 1994 - 2002
Mishimoto Aluminum Radiator: Dodge Ram 2500 / Ram 3500 1994 - 2002

Mishimoto Aluminum Perf Radiator: Ram 2500 / 3500 1994-2002 5.9L Diesel

Mishimoto

Regular price $990.00 $899.95 9% off

Unit price
per 

Mishimoto Transmission Cooler: Ram 6.7L Cummins (2013-2014)
Mishimoto Transmission Cooler: Ram 6.7L Cummins (2013-2014)

Mishimoto Transmission Cooler (Tube-Fin Core): Ram 2500 / 3500 2013-2014 6.7L Diesel

Mishimoto

Regular price $605.00 $549.95 9% off

Unit price
per 

Mishimoto Aluminum Coolant Y-Pipe (F&R): RAM 2500/3500/4500/5500 2013-2014 6.7L Cummins
Mishimoto Aluminum Coolant Y-Pipe (F&R): RAM 2500/3500/4500/5500 2013-2014 6.7L Cummins

Mishimoto Aluminum Coolant Y-Pipe: Dodge Ram 2500 / 3500 2013-2014 6.7L Diesel

Mishimoto

Regular price $71.00 $64.95 9% off

Unit price
per 

Mishimoto Silicone Radiator Hose Kit Red (F&R): RAM 2500 / 3500 / 4500 / 5500 6.7L Cummins 2013-2014
Mishimoto Silicone Radiator Hose Kit Red (F&R): RAM 2500 / 3500 / 4500 / 5500 6.7L Cummins 2013-2014

Mishimoto Silicone Radiator Hose Kit Red: Ram 2500 / 3500 2013-2014 6.7L Diesel

Mishimoto

Regular price $363.00 $329.95 9% off

Unit price
per 

Mishimoto Silicone Radiator Hose Kit Black (F&R): 13-14 RAM 2500/3500/4500/5500 6.7L Cummins
Mishimoto Silicone Radiator Hose Kit Black (F&R): 13-14 RAM 2500/3500/4500/5500 6.7L Cummins

Mishimoto Silicone Radiator Hose Kit Black: Ram 2500 / 3500 2013-2014 6.7L Diesel

Mishimoto

Regular price $363.00 $329.95 9% off

Unit price
per 

Mishimoto Silicone Radiator Hose Kit Blue (F&R): 13-14 RAM 2500/3500/4500/5500 6.7L Cummins
Mishimoto Silicone Radiator Hose Kit Blue (F&R): 13-14 RAM 2500/3500/4500/5500 6.7L Cummins

Mishimoto Silicone Radiator Hose Kit Blue: Ram 2500 / 3500 2013-2014 6.7L Diesel

Mishimoto

Regular price $363.00 $329.95 9% off

Unit price
per 

Mishimoto Aluminum Degas Tank: Ram 6.7L Cummins (13-18) Natural
Mishimoto Aluminum Degas Tank: Ram 6.7L Cummins (13-18) Natural

Mishimoto Aluminum Degas Tank Natural: Ram 2500 / 3500 2013-2018 6.7L Diesel

Mishimoto

Regular price $593.00 $538.95 9% off

Unit price
per 

Mishimoto Performance Aluminum Radiator: Multiple Fitments
Mishimoto Performance Aluminum Radiator: Multiple Fitments

Mishimoto Aluminum Perf Radiator: Ram 2500 / 3500 2013-2018 6.7L Diesel

Mishimoto

Regular price $1,127.00 $1,024.95 9% off

Unit price
per 

Mishimoto Transmission Cooler: Ram 6.7L Cummins (15-18)
Mishimoto Transmission Cooler: Ram 6.7L Cummins (15-18)

Mishimoto Transmission Cooler (Tube-Fin Core): Ram 2500 / 3500 2015-2018 6.7L Diesel

Mishimoto

Regular price $616.00 $559.95 9% off

Unit price
per 

Mishimoto Silicone Radiator Hose Kit Red (F&R): RAM 2500/3500/4500/5500 2015-2018 6.7L Cummins
Mishimoto Silicone Radiator Hose Kit Red (F&R): RAM 2500/3500/4500/5500 2015-2018 6.7L Cummins

Mishimoto Silicone Radiator Hose Kit Red: Ram 2500 / 3500 2015-2018 6.7L Diesel

Mishimoto

Regular price $363.00 $329.95 9% off

Unit price
per 

Mishimoto Silicone Radiator Hose Kit Blue (F&R): RAM 2500/3500/4500/5500 2015-2018 6.7L Cummins
Mishimoto Silicone Radiator Hose Kit Blue (F&R): RAM 2500/3500/4500/5500 2015-2018 6.7L Cummins

Mishimoto Silicone Radiator Hose Kit Blue: Ram 2500 / 3500 2015-2018 6.7L Diesel

Mishimoto

Regular price $363.00 $329.95 9% off

Unit price
per 

Mishimoto Silicone Radiator Hose Kit Black (F&R): RAM 2500/3500/4500/5500 2015-2018 6.7L Cummins
Mishimoto Silicone Radiator Hose Kit Black (F&R): RAM 2500/3500/4500/5500 2015-2018 6.7L Cummins

Mishimoto Silicone Radiator Hose Kit Black: Ram 2500 / 3500 2015-2018 6.7L Diesel

Mishimoto

Regular price $363.00 $329.95 9% off

Unit price
per 

Mishimoto Thermal Bypass Valve Kit: Ram 2500 / Ram 3500 2013-2018
Mishimoto Thermal Bypass Valve Kit: Ram 2500 / Ram 3500 2013-2018

Mishimoto Thermal Bypass Valve Kit Billet Aluminum: Ram 2500 / 3500 2013-2018 6.7L Diesel

Mishimoto

Regular price $110.00 $99.95 9% off

Unit price
per 

Mishimoto Thermal Bypass Valve Kit: Ram 2500 / Ram 3500 2013-2018
Mishimoto Thermal Bypass Valve Kit: Ram 2500 / Ram 3500 2013-2018

Mishimoto Thermal Bypass Valve Kit CNC Aluminum: Dodge Ram 2500 / 3500 2013-2018 6.7L Diesel

Mishimoto

Regular price $225.00 $204.95 9% off

Unit price
per 

HPS Silicone Radiator Hoses Kit: Dodge Ram 5.9L Diesel & 6.7L Diesel 2003 - 2010

HPS Silicone Radiator Hoses Kit: Dodge Ram 5.9L Diesel & 6.7L Diesel 2003 - 2010

HPS

Regular price $284.05 $247.00 13% off

Unit price
per 

3 colors
  • Red
  • Blue
  • Black
HPS Silicone Radiator Hoses Kit: Dodge Ram 5.9L Diesel 1999 - 2002

HPS Silicone Radiator Hoses Kit: Dodge Ram 5.9L Diesel 1999 - 2002

HPS

Regular price from $228.00 Up to 13% off

Unit price
per 

3 colors
  • Red
  • Blue
  • Black
Mishimoto Silicone Radiator Hose Kit Blue (F&R): Dodge Ram 2500/3500/4500/5500 03-10 5.9/6.7L Cummins
Mishimoto Silicone Radiator Hose Kit Blue (F&R): Dodge Ram 2500/3500/4500/5500 03-10 5.9/6.7L Cummins

Mishimoto Blue Silicone Hose Kit: Dodge Ram 2500/3500 5.9L/6.7L Diesel 2003-2010

Mishimoto

Regular price $220.00 $199.95 9% off

Unit price
per 

Mishimoto Silicone Radiator Hose Kit Black: Dodge Ram 2500/3500/4500/5500 2003-2010 5.9/6.7L Cummins
Mishimoto Silicone Radiator Hose Kit Black: Dodge Ram 2500/3500/4500/5500 2003-2010 5.9/6.7L Cummins

Mishimoto Black Silicone Hose Kit: Dodge Ram 2500/3500 5.9L/6.7L Diesel 2003-2010

Mishimoto

Regular price $220.00 $199.95 9% off

Unit price
per 

Mishimoto Top Heater Hose Upgrade -10AN (REAR): Dodge / RAM 2500/3500/4500/5500 2007-2025 6.7L Cummins
Mishimoto Top Heater Hose Upgrade -10AN (REAR): Dodge / RAM 2500/3500/4500/5500 2007-2025 6.7L Cummins

Mishimoto Top Heater Hose Upgrade: Dodge Ram 2500 / 3500 2008-2024 6.7L Diesel

Mishimoto

Regular price $110.00 $99.95 9% off

Unit price
per 

Spec D Aluminum Radiator (3-Row): Dodge Ram 5.9L Diesel 1994 - 2002
Spec D Aluminum Radiator (3-Row): Dodge Ram 5.9L Diesel 1994 - 2002

Spec D Aluminum Radiator (3-Row): Dodge Ram 5.9L Diesel 1994 - 2002

Spec D

Regular price $374.00 $277.00 26% off

Unit price
per 

Spec D Aluminum Radiator (2-Row): Dodge Ram 5.9L & 6.7L Diesel 2003 - 2009
Spec D Aluminum Radiator (2-Row): Dodge Ram 5.9L & 6.7L Diesel 2003 - 2009

Spec D Aluminum Radiator (2-Row): Dodge Ram 5.9L & 6.7L Diesel 2003 - 2009

Spec D

Regular price $394.00 $292.00 26% off

Unit price
per 

PPE Heater Core Supply Hose Kit: Ram 2500 / 3500 2007-2025
usa
PPE Lower Coolant Hose Kit: Dodge Ram (94-02)
usa
PPE Upper Coolant Hose Kit: Ram 1998.5-2002 5.9L Cummins
usa

Cooling Upgrades for 5.9L Magnum V8 and 6.7L Cummins Diesel Engines

The 5.9L Magnum V8 and 6.7L Cummins diesel engines are built for durability and heavy-duty performance, especially in towing applications. Upgrading the cooling system on these platforms is essential to maintain optimal operating temperatures and protect your engine during extended, high-load use.

How do cooling upgrades benefit the 5.9L Magnum and 6.7L Cummins?

Both engines generate significant heat under heavy towing and demanding conditions. Enhanced cooling components improve heat dissipation, helping prevent overheating and reducing engine wear. Proper cooling upgrades also support consistent performance and reliability, especially when your truck is under sustained load.

  • High-capacity radiators increase coolant volume and heat exchange
  • Upgraded fans improve airflow at low speeds and idle
  • Thermostats optimized for diesel temperature ranges ensure better coolant flow
  • Auxiliary cooling parts support turbocharged 6.7L Cummins under boost

What are key considerations when upgrading diesel cooling systems?

When selecting cooling upgrades for the 5.9L Magnum or 6.7L Cummins, focus on components designed specifically for diesel applications. Diesel engines run hotter and under higher torque loads than gasoline engines, so cooling parts must be robust and compatible with your engine’s cooling circuit. Proper fitment and quality materials are critical to ensure long-term durability and performance.

Find the right cooling upgrades for your 5.9L and 6.7L diesel at FastHemis

Whether you’re maintaining a classic 5.9L Magnum or maximizing the towing capability of your 6.7L Cummins, FastHemis offers cooling upgrades tailored to these engines. Browse our collection to find radiators, fans, thermostats, and auxiliary components engineered to keep your diesel running cooler and more reliably under load.

SELECT YOUR VEHICLE