5.9L / 6.7L Diesel Cooling Upgrades
Mishimoto Thermal Bypass Valve Kit (FRONT): Fits Chrysler/Dodge/Jeep/Ram 2006-2019 NAG1
Mishimoto
Regular price
$164.00
$148.95
9% off
- Unit price
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Mishimoto Low Temp Thermostat: 3.7L & 4.7L Dodge & Jeep
Mishimoto
Regular price
$76.00
$68.95
9% off
- Unit price
- /per
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
Mishimoto Thermal Bypass Full Flow: Ram 2500 / Ram 3500 2019-2024
Mishimoto
Regular price
$110.00
$99.95
9% off
- Unit price
- /per
PPE Radiator Upper & Lower Coolant Hose Kit: Ram 2500 / 3500 2013-2014 6.7L Diesel
PPE
$329.99
- Unit price
- /per
Mishimoto Mopar Pentastar / Hemi Thermal Bypass Valve Upgrade
Mishimoto
Regular price
$100.00
$90.95
9% off
- Unit price
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PPE Coolant Reroute Tube Polished SS: Dodge Ram 2500 / 3500 2003-2007 w/ Dual Fueler Kit
PPE
$299.99
- Unit price
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Mishimoto Radiator: Dodge Ram 1500 (03-08) / Ram 2500 (04-09) / Ram 3500 (04-08)
Mishimoto
Regular price
$660.00
$599.95
9% off
- Unit price
- /per
Mishimoto Thermal Bypass: Ram 2500 / Ram 3500 2019-2024
Mishimoto
Regular price
$225.00
$204.95
9% off
- Unit price
- /per
Mishimoto Silicone Radiator Hose Kit Blue (F&R): Dodge Ram 2500/3500/4500/5500 03-10 5.9/6.7L Cummins
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
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
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
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
Regular price
$394.00
$292.00
26% off
- Unit price
- /per
Holley Replacement Water Neck Seal: Fits Most Dodge / Jeep / Ram Models (2003-2023)
Holley
Regular price
$4.57
$3.65
20% off
- Unit price
- /per
PPE Lower Coolant Hose Kit 5mm 4-Ply Silicone: Dodge Ram 2003-2010 5.9L/6.7L Cummins
PPE
$99.99
- Unit price
- /per
PPE Upper Coolant Hose Kit 5mm 4-Ply Silicone: Dodge Ram 2003-2010 5.9L/6.7L Cummins
PPE
$99.99
- Unit price
- /per
PPE SS Heater Hose Connector: Dodge/Ram 6.7L Cummins / GM 6.6L Duramax 2007-2024 / 2017-2019
PPE
$24.99
- Unit price
- /per
PPE Silicone Coolant Hose Kit (Upper & Lower): Fits Ram 2010-2012 6.7L Cummins
PPE
$329.99
- Unit price
- /per
PPE Coolant Hose Kit Upper & Lower: Ram 2500 / 3500 2019-2024 6.7L Diesel
PPE
$249.99
- Unit price
- /per
PPE 6mm 5-Ply Silicone Coolant Hose (SHORT): Dodge Ram 2003-2012 5.9L/6.7L Diesel
PPE
$19.99
- Unit price
- /per
PPE Perf Silicone Upper & Lower Coolant Hose Kit: Ram 2500 / 3500 2015-2018 6.7L Diesel
PPE
$329.99
- Unit price
- /per
PPE Coolant Reroute Tube: Ram 2500 (07.5-12) / 3500 (07.5-12) 6.7L w/ Dual Fueler Kit
PPE
$299.99
- Unit price
- /per
HPS Hi Temp Reinforced Silicone Oil Cooler Hose Kit (BLACK): Fits Dodge Ram (03-06) w/ SS Clamps
HPS
$84.00
- Unit price
- /per
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
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
Mishimoto Replacement Radiator Hose Kit (F&R): Dodge Ram 2500/3500/4500/5500 03-10 5.9/6.7L Cummins
Mishimoto
Regular price
$194.00
$175.95
9% off
- Unit price
- /per
aFe BladeRunner Transmission Oil Cooler Kit (F&R): Dodge / RAM 2500/3500 2010-2012 6.7L Cummins
aFe
$415.00
- Unit price
- /per
Mishimoto Silicone Radiator Hose Kit Red (F&R): Dodge Ram 2500/3500/4500/5500 03-10 5.9/6.7L Cummins
Mishimoto
Regular price
$220.00
$199.95
9% off
- Unit price
- /per
Mishimoto Silicone Radiator Hose Kit Black (F&R): Dodge / RAM 2500/3500 2010-2012 6.7L Cummins
Mishimoto
Regular price
$271.00
$245.95
9% off
- Unit price
- /per
Mishimoto Silicone Radiator Hose Kit Red (F&R): Dodge / RAM 2500/3500 2010-2012 6.7L Cummins
Mishimoto
Regular price
$271.00
$245.95
9% off
- Unit price
- /per
Mishimoto Performance Aluminum Radiator: Ram 2500 / Ram 3500 2019-2024
Mishimoto
Regular price
$1,155.00
$1,049.95
9% off
- Unit price
- /per
Gates OE Exact Thermostat: Fits Most Dodge / Chrysler / Jeep / Ram Models (2003-2017)
Gates
$68.07
- Unit price
- /per
Mishimoto Silicone Radiator Hose Kit Black (F&R): 13-14 RAM 2500/3500/4500/5500 6.7L Cummins
Mishimoto
Regular price
$363.00
$329.95
9% off
- Unit price
- /per
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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.