Mishimoto Top Heater Hose Upgrade

2008–2024 Dodge Ram 2500 / 3500 6.7L Diesel

Part #: MMHOSE-RAM-07HU

Overview

The Mishimoto Top Heater Hose Upgrade is a precision-engineered replacement hose designed specifically for Dodge Ram heavy-duty trucks equipped with the 6.7L Cummins diesel engine from 2008 through 2024. This upgrade addresses a common failure point in the factory heater hose system—the quick-disconnect fitting—which is prone to coolant leaks and reduced heating system performance. By replacing this weak link with a robust, O-ring-less -10AN connection, Mishimoto provides a durable, leak-free solution that enhances coolant flow reliability and protects your engine’s heating system under demanding conditions.

Ideal for Cummins enthusiasts and truck owners who require improved cooling system durability, this direct-fit upgrade ensures peace of mind during heavy towing, hauling, or daily driving. It is engineered to withstand the rigors of heavy-duty use while maintaining seamless integration with your truck’s existing cooling system.

Key Features

Engineered for superior reliability and longevity, the Mishimoto Top Heater Hose Upgrade offers the following benefits:

• Replaces the factory quick-disconnect fitting prone to leaks with a durable, O-ring-less -10AN connection
• Pre-installed thread sealant ensures a secure, leak-free connection right out of the box
• Constructed to withstand the high temperatures and pressures typical of Cummins diesel cooling systems
• Direct-fit design for Dodge Ram 2500, 3500, 4500, and 5500 models from 2007.5 to 2025, covering multiple trims and configurations
• Improves coolant flow reliability, reducing the risk of overheating and coolant loss
• Reinforced hose construction resists cracking, swelling, and deterioration over time
• Backed by the Mishimoto Lifetime Warranty for long-term confidence

Construction & Design

The Mishimoto Top Heater Hose Upgrade is crafted from premium materials engineered to endure the harsh conditions of heavy-duty diesel engines. Its reinforced construction resists cracking, swelling, and degradation caused by heat and pressure cycles, ensuring long-lasting durability. The innovative O-ring-less -10AN fitting eliminates the weak point found in factory quick-disconnects, providing a more robust and secure connection that maintains integrity under thermal cycling and vibration.

Manufactured to meet or exceed OEM specifications, this hose offers a perfect fit and finish for seamless integration into your truck’s cooling system. The pre-applied thread sealant further guarantees a leak-proof installation, minimizing maintenance and downtime.

Installation & Fitment

Installation is straightforward and designed for a hassle-free upgrade. The Mishimoto Top Heater Hose Upgrade fits directly onto the factory coolant ports without requiring any modifications, adapters, or special tools. This plug-and-play design allows for quick replacement of the original heater hose, saving time and effort during routine maintenance or cooling system upgrades.

This product is compatible with a wide range of Dodge Ram 2500, 3500, 4500, and 5500 models equipped with the 6.7L Cummins engine, covering model years 2008 through 2024. It supports numerous trims including Laramie, SLT, ST, SXT, TRX, Big Horn, Limited, Longhorn, Lone Star, Outdoorsman, Rebel, and Tradesman, ensuring broad applicability for Ram owners.

What's Included

• Mishimoto Top Heater Hose with integrated -10AN O-ring-less fitting
• Pre-installed thread sealant for leak-free connection
• Installation instructions

Ideal For

This upgrade is perfect for Dodge Ram 2500, 3500, 4500, and 5500 owners who demand enhanced cooling system reliability, especially those who frequently tow, haul, or operate their trucks under heavy loads. Cummins enthusiasts looking to prevent common coolant leaks and improve the longevity of their engine’s heating system will find this product invaluable. It is also an excellent choice for anyone performing routine maintenance or cooling system upgrades on their 6.7L Cummins-powered Ram trucks.

Mishimoto is a performance cooling brand offering aluminum radiators, intercoolers, oil coolers, hoses, and supporting hardware built to manage heat on hard-driven street and track vehicles. For boosted setups and towing/off-road rigs alike, Mishimoto upgrades are designed to increase cooling capacity and reliability where factory systems can become a limitation.