Mishimoto Thermostat w/ Aluminum Housing: Jeep Wrangler JL / Gladiator 3.6L (2018-2026) - 90C

Mishimoto Thermostat with Aluminum Housing

2018–2026 Jeep Wrangler JL / Gladiator 3.6L Pentastar

MMTS-MOP-18E

Overview:

The Mishimoto Thermostat with Aluminum Housing is a direct replacement for the factory thermostat assembly on 2018 to 2026 Jeep Wrangler JL and Gladiator models equipped with the 3.6L Pentastar engine. Designed to address the common failure points of the stock plastic thermostat housing, this upgrade swaps out the fragile OEM component for a robust cast aluminum housing that resists cracking and leaking under demanding conditions.

Calibrated to open at 195°F (90°C), this thermostat maintains the engine’s optimal operating temperature, ensuring reliable cooling performance without sacrificing drivability, fuel efficiency, or emissions compliance. Whether you’re navigating daily commutes, towing heavy loads, or tackling off-road trails, the Mishimoto thermostat keeps your Pentastar engine running smoothly and efficiently.

Key Features:

Engineered for durability and precision, the Mishimoto Thermostat with Aluminum Housing offers several advantages over the factory unit:

• Replaces the failure-prone plastic housing with a rugged cast aluminum construction to eliminate common leak points
• Thermostat calibrated to OEM specifications, opening at 195°F (90°C) for accurate temperature regulation
• Premium wax element ensures consistent and reliable thermostat operation under all conditions
• Designed specifically for 2018–2026 Jeep Wrangler JL and Gladiator 3.6L Pentastar engines for perfect fitment
• Improves cooling system reliability, reducing the risk of overheating and costly repairs
• Backed by Mishimoto’s Lifetime Warranty for long-term peace of mind
• Maintains factory coolant flow characteristics to preserve engine performance and emissions standards

Construction & Design:

The thermostat housing is crafted from high-quality cast aluminum, providing superior strength and heat resistance compared to the original plastic component. This durable material withstands the thermal cycling and mechanical stresses common in off-road and towing applications, preventing cracks and coolant leaks that often plague stock housings.

The thermostat itself features a premium wax pellet that expands precisely at the designated temperature, ensuring smooth and consistent valve operation. This precision engineering guarantees that your engine reaches and maintains its ideal operating temperature for optimal performance and longevity.

Installation & Fitment:

Installation is straightforward and designed to be a direct bolt-on replacement for the factory thermostat and housing assembly on 2018–2026 Jeep Wrangler JL and Gladiator models with the 3.6L Pentastar engine. No modifications or additional parts are required, making it an ideal upgrade for enthusiasts and technicians alike. Standard hand tools are sufficient for the swap, and the improved durability of the aluminum housing reduces the likelihood of future coolant leaks.

What's Included:

• Mishimoto thermostat calibrated to open at 195°F (90°C)
• Durable cast aluminum thermostat housing
• Gaskets and seals necessary for installation
• Installation instructions

Ideal For:

This thermostat and housing assembly is perfect for Jeep Wrangler JL and Gladiator owners who demand greater reliability from their cooling system. It is especially suited for those who frequently tow, off-road, or drive in extreme conditions where the factory plastic housing is prone to failure. Daily drivers seeking to prevent overheating and coolant leaks will also benefit from this durable upgrade.