Mishimoto Aluminum Coolant Expansion Tank

2018–2026 Jeep Wrangler JL 2.0L Turbo, 3.6L V6 / 2020–2026 Jeep Gladiator JT 3.6L V6 / 2020–2023 Jeep Wrangler JL 3.0L EcoDiesel / 2021–2023 Jeep Gladiator JT 3.0L EcoDiesel

Part #: MMRT-JL-18

Overview

The Mishimoto Aluminum Coolant Expansion Tank is a direct replacement upgrade designed specifically for Jeep Wrangler JL and Gladiator JT models from 2018 through 2026. Engineered to replace the factory plastic coolant tanks that are prone to cracking and leaking, this robust aluminum tank offers enhanced durability and reliability for both daily driving and off-road adventures. Its increased fluid capacity and OEM-style internal baffling ensure optimal coolant management, preventing aeration and fluid sloshing during aggressive trail use or uneven terrain.

Built for Jeep enthusiasts who demand long-lasting performance and peace of mind, this expansion tank eliminates the common failure points of stock tanks, helping you avoid unexpected coolant loss and engine overheating. The included Mishimoto radiator cap and lifetime warranty further reinforce its status as a dependable cooling system upgrade.

Key Features

Designed with precision and durability in mind, the Mishimoto Aluminum Coolant Expansion Tank offers several key benefits:

• Constructed from TIG-welded aluminum for superior strength and resistance to cracking
• Increased coolant capacity compared to the factory tank for improved cooling system efficiency
• Internal OEM-style baffling to prevent coolant aeration and sloshing during off-camber driving or rough terrain
• Wrinkle black powder-coated finish provides corrosion resistance and a rugged, refined appearance
• Easy-to-read sight glass replaces the factory dipstick for quick and accurate fluid level checks
• Includes a high-quality Mishimoto radiator cap engineered for optimal pressure management
• Direct bolt-on fitment with no modifications required for Jeep Wrangler JL and Gladiator JT models listed
• Backed by Mishimoto’s lifetime warranty for long-term reliability and customer confidence

Construction & Design

This expansion tank is crafted from premium-grade aluminum, TIG-welded to ensure a leak-proof and durable construction that outperforms the fragile plastic OEM tanks. The wrinkle black powder-coated finish not only enhances corrosion resistance but also adds a sleek, rugged look to your engine bay. Internal baffling mimics the original equipment design to maintain coolant stability, preventing air pockets and fluid movement that can compromise cooling efficiency during off-road excursions.

The integrated sight glass replaces the factory dipstick, providing a clear and convenient way to monitor coolant levels without removing the cap. Every detail is engineered to meet the demanding conditions faced by Jeep owners who push their vehicles on and off the road.

Installation & Fitment

Installation is straightforward and designed to be completed with basic hand tools, typically taking less than an hour. This tank is a direct replacement for the factory coolant expansion tank on 2018–2026 Jeep Wrangler JL models equipped with 2.0L Turbo, 3.6L V6, and 3.0L EcoDiesel engines, as well as 2020–2026 Jeep Gladiator JT models with 3.6L V6 and 3.0L EcoDiesel engines. No cutting, drilling, or modifications are necessary, making it an ideal upgrade to complete before your next weekend trail ride or daily commute.

What's Included

• Mishimoto Aluminum Coolant Expansion Tank
• Mishimoto Radiator Cap
• Mounting hardware and installation instructions

Ideal For

This aluminum coolant expansion tank is perfect for Jeep Wrangler JL and Gladiator JT owners who want to eliminate the common failure points of the stock plastic tanks. It is especially suited for off-road enthusiasts, daily drivers, and anyone seeking a reliable, long-lasting cooling system upgrade that can handle the rigors of trail use and extreme conditions without worry.

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.