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3.7L / 4.0L Cooling Upgrades

Cooling Upgrades for 3.7L and 4.0L Engines The 3.7L V6 and 4.0L V6 engines are known for their durability and solid performance in various Chrysler, Dodge, and Jeep models. While these engines deliver dependable power, maintaining optimal operating temperatures is key to preserving reliability and preventing overheating during demanding driving conditions. This collection features cooling upgrades tailored specifically for the 3.7L and 4.0L platforms. From enhanced radiators and high-flow water pumps to performance thermostats and cooling fans, these parts help improve heat dissipation and maintain stable engine temperatures. Whether you’re tackling heavy loads, off-road trails, or daily driving, proper cooling ensures your engine runs efficiently and lasts longer. Key cooling upgrades include: - High-capacity radiators for better coolant flow - Performance water pumps for increased circulation - Upgraded thermostats for precise temperature control - Electric cooling fans for improved airflow - Durable hoses and fittings designed for Mopar fitment Shop 3.7L / 4.0L cooling upgrades at FastHemis.
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27 Results

Killerglass Upper Radiator Hose Kit: Jeep Grand Cherokee 2005 - 2024 (V8 Only)
usa

Killerglass Upper Radiator Hose Kit: Jeep Grand Cherokee 2005 - 2023 (V8 Only)

KillerGlass
5.0 (1)

Regular price from $169.00 15% off

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Mishimoto 12-18 Jeep Wrangler JK Transmission Thermal Bypass Valve Kit
Mishimoto 12-18 Jeep Wrangler JK Transmission Thermal Bypass Valve Kit

Mishimoto Thermal Bypass Valve Kit (FRONT): Fits Chrysler/Dodge/Jeep/Ram 2006-2019 NAG1

Mishimoto

Regular price $164.00 $148.95 9% off

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Spec D Aluminum Radiator: Jeep Grand Cherokee 4.0L w/ Automatic Transmission 1999 - 2004
Spec D Aluminum Radiator: Jeep Grand Cherokee 4.0L w/ Automatic Transmission 1999 - 2004

Spec D Aluminum Radiator: Jeep Grand Cherokee 4.0L w/ Automatic Transmission 1999 - 2004

Spec D

Regular price $274.00 $203.00 26% off

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PPE Dual Fueler Coolant Hose: Dodge Ram (03-12)
PPE Dual Fueler Coolant Hose: Dodge Ram (03-12)
usa
Holley Replacement Water Neck Seal: Fits Most Dodge / Jeep / Ram Models (2003-2023)

Holley Replacement Water Neck Seal: Fits Most Dodge / Jeep / Ram Models (2003-2023)

Holley

Regular price $4.46 $2.18 51% off

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HPS Silicone Radiator & Heater Hoses Kit: Jeep Wrangler TJ 4.0L I6 2002 - 2006
HPS Silicone Radiator & Heater Hoses Kit: Jeep Wrangler TJ 4.0L I6 2002 - 2006

HPS Silicone Radiator & Heater Hoses Kit: Jeep Wrangler TJ 4.0L I6 2002 - 2006

HPS

Regular price from $252.00 Up to 13% off

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3 colors
HPS Silicone Heater Hoses Kit: Jeep	Wrangler TJ 4.0L I6 2002 - 2006
HPS Silicone Heater Hoses Kit: Jeep	Wrangler TJ 4.0L I6 2002 - 2006

HPS Silicone Heater Hoses Kit: Jeep Wrangler TJ 4.0L I6 2002 - 2006

HPS

Regular price from $124.00 Up to 13% off

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per 

3 colors
HPS Silicone Heater Hoses Kit: Jeep Wrangler TJ 4.0L I6 1997 - 2001
HPS Silicone Heater Hoses Kit: Jeep Wrangler TJ 4.0L I6 1997 - 2001

HPS Silicone Heater Hoses Kit: Jeep Wrangler TJ 4.0L I6 1997 - 2001

HPS

Regular price $149.50 $130.00 13% off

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per 

3 colors
HPS Silicone Radiator Hoses Kit: Jeep Grand Cherokee	4.0L I6 1999 - 2004
HPS Silicone Radiator Hoses Kit: Jeep Grand Cherokee	4.0L I6 1999 - 2004

HPS Silicone Radiator Hoses Kit: Jeep Grand Cherokee 4.0L I6 1999 - 2004

HPS

Regular price $171.35 $149.00 13% off

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per 

3 colors
HPS Silicone Radiator Hoses Kit: Jeep Wrangler TJ 4.0L I6 2000 - 2006
HPS Silicone Radiator Hoses Kit: Jeep Wrangler TJ 4.0L I6 2000 - 2006

HPS Silicone Radiator Hoses Kit: Jeep Wrangler TJ 4.0L I6 2000 - 2006

HPS

Regular price from $155.00 Up to 13% off

Unit price
per 

3 colors
HPS Silicone Radiator & Heater Hoses Kit: Jeep Wrangler TJ 4.0L I6 2000 - 2001
HPS Silicone Radiator & Heater Hoses Kit: Jeep Wrangler TJ 4.0L I6 2000 - 2001

HPS Silicone Radiator & Heater Hoses Kit: Jeep Wrangler TJ 4.0L I6 2000 - 2001

HPS

Regular price from $241.00 Up to 13% off

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per 

3 colors
HPS Silicone Radiator Hoses Kit: Jeep Grand Cherokee	3.7L V6 2005 - 2010
HPS Silicone Radiator Hoses Kit: Jeep Grand Cherokee	3.7L V6 2005 - 2010

HPS Silicone Radiator Hoses Kit: Jeep Grand Cherokee 3.7L V6 2005 - 2010

HPS

Regular price from $174.00 Up to 13% off

Unit price
per 

3 colors
HPS Silicone Radiator & Heater Hoses Kit: Jeep Grand Cherokee	4.0L I6 1993 - 1998
HPS Silicone Radiator & Heater Hoses Kit: Jeep Grand Cherokee	4.0L I6 1993 - 1998

HPS Silicone Radiator & Heater Hoses Kit: Jeep Grand Cherokee 4.0L I6 1993 - 1998

HPS

Regular price from $209.00 Up to 13% off

Unit price
per 

3 colors

Cooling Upgrades for 3.7L V6 and 4.7L V8 Engines

The 3.7L V6 and 4.7L V8 engines are reliable powerplants commonly found in Dodge, Jeep, and Ram vehicles, known for their balance of capability and durability. Upgrading the cooling system on these engines is essential to maintain optimal operating temperatures, especially during heavy towing, off-road use, or performance driving.

Why upgrade cooling components on your 3.7L or 4.7L engine?

Both the 3.7L and 4.7L engines benefit from enhanced cooling to prevent overheating and reduce thermal stress on engine components. Stock cooling systems can struggle under increased load or in hot climates, leading to reduced performance and potential engine damage. Upgrading cooling parts helps maintain consistent temperatures and extends engine life.

  • Improved heat dissipation reduces risk of overheating
  • Supports higher power output and towing demands
  • Enhances reliability during extended heavy use
  • Helps maintain stable operating temperatures in harsh conditions

Key cooling upgrades for the 3.7L and 4.7L platforms

Effective cooling upgrades include high-capacity radiators that increase coolant flow and performance water pumps that ensure consistent circulation. Upgraded thermostats provide more precise temperature regulation, while electric or mechanical cooling fans improve airflow through the radiator, especially at low speeds or idle.

Choosing the right cooling parts for your 3.7L / 4.7L engine

Selecting cooling upgrades tailored to your engine platform ensures proper fitment and optimal performance. Whether you’re upgrading for towing, off-road, or daily driving, FastHemis offers a range of radiators, water pumps, thermostats, and fans designed specifically for the 3.7L and 4.7L engines. Shop our collection to keep your engine running cool and reliable.

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